George Westinghouse

Railroad air brakes and signaling/switching systems

During his travels, Westinghouse had witnessed the aftermath of a collision where engineers on two trains, approaching each other on the same track, had seen each other but were unable to stop their trains in time due to the existing brake systems. At that time, brakemen had to run along catwalks on the top of the cars, manually applying the brakes. Coordinating that process was tricky and dangerous. It also meant trains could not exceed ten cars in length, and thousands of brakemen died or were maimed each year.

In 1869, at age 23, Westinghouse first publicly demonstrated his revolutionary new railroad braking system in Pittsburgh. It stopped trains using a compressed air system. His first braking system used an air compressor and an air reservoir in the locomotive, with a single compressed air pipe running the length of the train and with flexible connections between cars. That line controlled the brakes, allowing the engineer to apply and release the brakes simultaneously on all cars. A charter for what would eventually become the Westinghouse Air Brake Company was filed in July of that year.

Although the system was successful, as demonstrated when it prevented a serious mishap in front of assembled witnesses, it was hardly fail-safe. Any rupture or disconnection in the air line left the train without brakes. Over the next two years, Westinghouse and his engineers addressed the problem by inverting the process, designing valves so that constant pressure in the lines kept the brakes disengaged. An air reservoir was also placed on each car. With the improved design, any interruption or break in the line automatically caused the train to stop.

During the next decade, building on his earliest inventions, Westinghouse expanded his interest to railway signaling and track-switching systems. Previously, signaling relied on oil lamps and track switching was performed manually. Westinghouse's designs changed all that. In May 1881, Westinghouse founded the Union Switch and Signal Company to manufacture, market, install, and maintain these innovative control systems, which were eventually adopted by railroads around the world.

Natural gas

By 1883, Westinghouse had become interested in natural gas. Gas had recently been discovered in nearby Murrysville, Pennsylvania, and it attracted a lot of attention, in part because of a spectacular flaming blowout of the Haymaker Well in 1878. After visiting the well and recognizing its commercial potential, he undertook drilling for gas on his estate Solitude (today's Westinghouse Park) in Pittsburgh.

Early in the morning of May 21, 1884, the drilling crew struck a pocket of gas at a depth of 1500 feet, and the resulting blast of dirt and water blew the top off the derrick. It took Westinghouse a week to devise a method to cap the flow of gas. He was encouraged to develop a system to deliver gas to heat and light area homes and businesses. Eventually, several natural gas derricks towered above his estate's Victorian-era gardens. In modern times there is no above-ground trace left of these derricks.

That year, Westinghouse acquired a dormant utility charter for "The Philadelphia Company", and over the next three years, he developed devices and secured more than 30 patents for this technology. He used the Philadelphia Company to develop gas wells and to promote gas usage both for commercial and residential purposes. By 1886, the Philadelphia Company owned 58 wells and 184 miles of distribution piping in the Pittsburgh area, and by 1887, it served over 12,000 private homes and 582 industrial customers throughout the state.

In 1889, as his involvement with the generation and distribution of electricity was surging, Westinghouse resigned as president of the Philadelphia Company, but he remained on its board. Growth in the natural gas business slowed in the 1890s, hindered by supply problems and ongoing safety concerns related to gas distribution in homes and businesses. However, the Philadelphia Company continued to grow, spawning enterprises such as Equitable Gas and Duquesne Light.

Electric power distribution

In the early 1880s, Westinghouse's interest in railroad switching and natural gas distribution led him to become involved in the then-new field of electrical power distribution. Electric lighting of streets using arc lighting was already a growing business with many companies building systems powered by either locally generated direct current (DC) or alternating current (AC). At the same time, Thomas Edison was launching the first DC electric utility designed to light homes and businesses with his patented incandescent bulb.

In 1884, Westinghouse began developing his own DC domestic lighting system and hired physicist William Stanley to help work on it. In 1885, Westinghouse became aware of the concept of an electrical transformer introduced by Frenchman Lucien Gaulard and Englishman John Gibbs. Westinghouse was alerted by Guido Pantaleoni, an Italian engineer in his employ, to the already-patented Gaulard-Gibbs transformer design, and to an already deployed system capable of transmitting electricity for many miles near London, Turin, and Rome. They had found that AC electricity could be "stepped up" in voltage by a transformer for transmission and then "stepped down" by another transformer for lower voltage consumer use. This innovation made it possible for large centralized power plants to generate electricity and supply it over long distances to both cities and places with more dispersed populations. This was a huge advantage over the low voltage DC systems being marketed by Edison’s electric utility, which limited generating stations to a transmission range of about a mile due to losses caused by the low voltages and high currents used. Westinghouse recognized AC's potential to achieve greater economies of scale as a way to create a truly competitive electrical system, rather than simply piecing together a barely competitive DC lighting system just different enough to get around Edison’s patents.

In 1885, Westinghouse imported several Gaulard–Gibbs transformers and a Siemens AC generator to begin experimenting with AC networks in Pittsburgh. Stanley, assisted by engineers Albert Schmid and Oliver B. Shallenberger, dramatically improved the Gaulard–Gibbs transformer design, creating the first practical and manufacturable transformer. In 1886, with Westinghouse's backing, Stanley installed the first multiple-voltage AC power system in Great Barrington, Massachusetts. The demonstration lighting system was driven by a hydroelectric generator that produced 500 volts AC, which was then stepped down to 100 volts to light incandescent bulbs in homes and businesses. That same year, Westinghouse founded the "Westinghouse Electric & Manufacturing Company"; in 1889 he renamed it the "Westinghouse Electric Corporation".

War of the currents

The Westinghouse company installed thirty more AC-lighting systems within a year, and by the end of 1887 it had 68 alternating current power stations compared to 121 DC-based stations Edison had installed over seven years. This competition with Edison led, in the late 1880s, to what became known as the "war of currents". Thomas Edison and his company joined and promoted a spreading public perception that the high voltages used in AC distribution were unsafe and deadly. Edison even suggested that a Westinghouse AC generator should be used in the State of New York's new electric chair.

Westinghouse also had to deal with another AC rival, the Thomson-Houston Electric Company, which had constructed 22 power stations by the end of 1887 and by 1889 it had acquired another competitor, the Brush Electric Company. Thomson-Houston was expanding its business while trying to avoid patent conflicts with Westinghouse, arranging deals such as agreements over lighting company territory, paying royalties to use the Stanley transformer patent, and allowing Westinghouse to use its Sawyer–Man incandescent bulb patent.

In 1890, the Edison company, in collusion with Thomson-Houston, arranged for the first electric chair to be powered with a Westinghouse AC generator. Westinghouse tried to block this move by hiring the best lawyer of the day to (unsuccessfully) defend William Kemmler, the first man scheduled to die in the chair.

The War of Currents ended in 1892 when financier J. P. Morgan forced Edison General Electric to switch to AC power and then pushed Edison out of the company he had founded. Edison General Electric company was merged with the Thomson-Houston Electric Company to form General Electric, a conglomerate controlled by the board of Thomson-Houston.

Development and competition

During this period, Westinghouse continued to pour money and engineering resources into the goal of building a completely integrated AC system — obtaining the Sawyer–Man lamp by buying Consolidated Electric Light, and developing components such as an induction meter, and obtaining the rights to inventor Nikola Tesla's brushless AC induction motor along with patents for a new type of electric power distribution, polyphase alternating current. The acquisition of a feasible AC motor gave Westinghouse a key patented element for his system, but the financial strain of buying up patents and hiring the engineers needed to build it meant that the development of Tesla's motor had to be put on hold for a while.

In 1891, Westinghouse's company was in trouble. The near collapse of Barings Bank in London triggered the financial panic of 1890, causing investors to call in their loans. The sudden cash shortage forced the company to refinance its debts. The new lead lenders demanded that Westinghouse cut back on what looked to them like his excessive spending on the acquisition of other companies, research, and patents.

Also in 1891, Westinghouse built a hydroelectric AC power plant, the Ames Hydroelectric Generating Plant near Ophir, Colorado which supplied AC power to the Gold King Mine 3.5 miles away. This was the first successful demonstration of long-distance transmission of industrial-grade alternating current power and utilized two 100 hp Westinghouse alternators, one working as a generator producing 3,000-volt, 133-Hertz, single-phase AC, and the other used as an AC motor.

In May 1892, Westinghouse Electric won the bid to power and illuminate the 1893 World's Columbian Exposition in Chicago with alternating current, substantially underbidding General Electric to get the contract. To meet the contract's demands, he had to quickly develop a new type of incandescent lightbulb based on the Sawyer–Man patent he had obtained, ensuring it did not infringe on the Edison patent design.

By the beginning of 1893, Westinghouse engineer Benjamin Lamme had made great progress in developing an efficient version of Tesla's induction motor. In that work he was aided by his sister and fellow Westinghouse engineer Bertha Lamme Feicht. Westinghouse Electric started branding their complete polyphase AC system as the "Tesla Polyphase System", announcing Tesla's patents gave them patent priority over other AC systems and stating their intention to sue any patent infringers.

This World's Fair devoted a building to electrical exhibits. It was a key event in the history of AC power, as Westinghouse demonstrated the safety, reliability, and efficiency of a fully integrated alternating current system to the American public.

Westinghouse's demonstration of their ability to build a complete AC system at the Columbian Exposition was instrumental in the company getting the contract for building a two-phase AC generating system, the Adams Power Plant, at Niagara Falls, NY, in 1895. The company was subcontracted to build ten 5,000 horsepower (3,700 kW) 25 Hz AC generators at this plant. Westinghouse's Niagara Power Station No. 1, as it was then called, remained in operation in the Niagara transformer house until the plant closed in 1961.

At the same time, a contract to build the three-phase AC distribution system the project needed was awarded to General Electric. The early to mid-1890s saw General Electric, backed by financier J. P. Morgan, engaged in costly takeover attempts and patent battles with Westinghouse Electric. The competition was so costly that in 1896 a patent-sharing agreement was signed between the two companies. The agreement stayed in effect until 1911.

Following the success of the first Niagara Falls plant, the Rankine Generating Station, also known as The Canadian Niagara Power Generating Station, the Canadians contracted with Westinghouse for eleven 25 Hertz generators of the same Tesla-inspired design, rated for a total generating capacity of 100 MW. That facility opened in 1905 in Niagara Falls, Ontario.

Other Westinghouse projects: steam engines, maritime propulsion, and shock absorbers

Despite continuing success in his other businesses, Westinghouse's main interest shifted to electric power generation. At the outset, the available generating sources were hydro turbines where falling water was available, and reciprocating steam engines where it was not. Westinghouse felt that existing reciprocating steam engines were clumsy and inefficient, and he wanted to develop rotating engines that would be more elegant. His first patent had been for a rotary steam engine, but it proved impractical at the time.

In 1884, the British engineer Charles Algernon Parsons at Clarke, Chapman and Co began experimenting with steam turbines and generators, producing a 10-horsepower (7.5 kW) turbo-generator. In 1895, Westinghouse bought rights to the Parsons turbine, and his engineers improved its technology and increased its scale. In 1898, Westinghouse demonstrated a 300-kilowatt generating unit, replacing reciprocating engines in his air-brake factory. The next year, he installed a 1.5-MW 1200 rpm unit for the Hartford Electric Light Company.

Westinghouse also developed steam turbines for maritime propulsion. The basic problem was that large turbines ran most efficiently at around 3000 rpm, while an efficient propeller operated only at about 100 rpm. This required reduction gearing, but designing reduction gearing that could operate at both high rpm and at high power was difficult, since any slight misalignment would shake the powertrain to pieces. Westinghouse and his engineers invented an automatic self-alignment system that finally made turbine power practical for large vessels.

In 1889, Westinghouse purchased several mining claims in the Patagonia Mountains of southeastern Arizona and formed the Duquesne Mining & Reduction Company. He hoped to invent a better way to mine and extract copper from "lean" ores that were not particularly rich in the metal. Success is this venture would have helped him compete in the electrical businesses that used much copper. He was unsuccessful in this project: no new copper reduction process was found and the mine was not profitable. He had founded the town of Duquesne to use as his company headquarters; it is now a ghost town. Duquesne grew to over 1,000 residents and the mine reached its peak production in the mid-1910s.

Westinghouse also began to work on heat pumps that could provide heating and cooling. When Westinghouse claimed he was after a perpetual motion machine, the British physicist William Thomson (Lord Kelvin), one of his many correspondents, told him that such a machine would violate the laws of thermodynamics. Westinghouse replied that while it might be the case, it made no difference. If he couldn't build a perpetual motion machine, he would still have a heat pump system that he could patent and sell.

After the broader introduction of the automobile, Westinghouse invented a compressed air shock absorber for their suspension systems. The shock absorber was among the last of the 360 patents he received, and it was awarded posthumously, two years after his death.

Labor relations

Westinghouse was the first industrial employer in the United States to give workers a five-and-a half day work week, starting in June 1881. Saturdays were made half holidays to promote community involvement and personal development. Westinghouse had observed the practice while visiting England.

The planned community of Wilmerding, Pennsylvania was home to many Westinghouse employees, and it was also the headquarters of several companies, particularly Westinghouse Air Brake. Westinghouse Electric and Manufacturing was located a mile further down the Turtle Creek valley east of Pittsburgh. The worker houses were outfitted with running water, electricity, gas, and often space for small gardens. Homeownership was facilitated through periodic salary deductions. There was a pension and an insurance system. Factories were well-lit, ventilated, and were outfitted with medical facilities and personnel for treating injuries. All these accommodations, at Westinghouse's expense, were considered highly innovative at the time, especially in contrast to the conditions endured by workers in the nearby steel mills.

Westinghouse was broadly admired by his workers. Privately, they referred to him as "the Old Man". An indication of his progressive attitude was that when Westinghouse engineers invented things, they were allowed to keep their names on the patents, though assigning rights to use them to the company. Westinghouse viewed this as part of the dignity of man and part of his intellectual property. Westinghouse, unlike Edison, did not put his name on all company patents as co-inventor.

Westinghouse was not in favor of labor unionization. He did not reject workers who belonged to a union, but he did not like collective bargaining arrangements where his workers might strike for issues not related to conditions at his own factories. There was only one strike at any Westinghouse company while he was in charge. It was a 1903 action at Westinghouse Machine Company, which was rushing to illuminate the 1904 St. Louis World's Fair. Westinghouse responded by immediately hiring replacements for those employees who walked out. Despite that action, American labor and union organizer Samuel Gompers is reputed to have said "If all employers of men treated their employees with the same consideration he does, the American Federation of Labor would have to go out of existence".

A series of short movies showing conditions in and around Westinghouse factories was made in 1904 and exhibited at the St. Louis World's Fair.

Personal life, later life, and death

In 1867, Westinghouse met Marguerite Erskine Walker on a train, and they married in August of that year. They were married for 47 years, and had one son, George Westinghouse III, who in turn had six children.

From 1871, George and Marguerite Westinghouse maintained a large home in Pittsburgh called Solitude, building up from an existing house on land purchased by George in 1871. They were part of a social class of very rich local industrialists and money managers including neighbors and associates Henry Clay Frick, Henry J. Heinz, William Thaw, Andrew Mellon, and Richard Beatty Mellon, and the brothers Andrew Carnegie and Thomas Carnegie. Their guests included Nikola Tesla, Lord Kelvin, and congressman (and future president) William McKinley.

By 1893, they had constructed Erskine Park in Lenox, Massachusetts, which they used as a summer home, in part as a respite from the gritty industrial environment of Pittsburgh. It was named for the family of Marguerite's grandparents.

In 1898, the Westinghouses leased and then in 1901 purchased the Blaine House mansion in Washington D.C. Marguerite Westinghouse was reputed to host frequent and lavish entertainments there. In 1918, their former Pittsburgh home, Solitude, was razed and the land given to the City of Pittsburgh to establish Westinghouse Park. The house in Erskine Park was sold by the family in 1917 and subsequently demolished.

In 1894, the Grand Army of the Republic, a fraternal organization of Union Civil War veterans, held a week-long convention in Pittsburgh. George Westinghouse, being a veteran himself, hosted an evening of dinner and entertainment for more than 5,000 attendees at the newly constructed, but not yet active main buildings of the Westinghouse Electric and Manufacturing Company in East Pittsburgh. He took on the expenses of the necessary building preparations and all the expenses of transporting people to and from the site by rail.

Pride in his achievements with the airbrake is reflected in the comment published in 1904: "If some day they say of me that with the airbrake I contributed something to civilization, something to the safety of human life, it will be sufficient."

George Westinghouse remained a captain of American industry until 1907 when the financial panic of 1907 led to his resignation from control of the Westinghouse Electric company. By 1911, he was no longer active in business, and his health was in decline. Westinghouse died on March 12, 1914, in New York City at age 67. He was initially interred in Woodlawn Cemetery, Bronx, NY then removed on December 14, 1915. As a Civil War veteran, he was buried in Arlington National Cemetery, along with his wife Marguerite, who survived him by three months. She had also been initially interred in Woodlawn but removed and reinterred at the same time as George.

Honors and awards

George Westinghouse was deeply appreciated by his colleagues and employees. For example, Nikola Tesla, with whom he developed the AC polyphase system of electric power distribution spoke of him in 1938 as follows: "George Westinghouse was, in my opinion, the only man on this globe who could take my alternating-current system under the circumstances then existing and win the battle against prejudice and money power. He was a pioneer of imposing stature, one of the world's true noblemen, of whom America may well be proud and to whom humanity owes an immense debt of gratitude."

List of Honors and Awards adapted from Ref.

• In 1874, he was awarded the Scott Legacy Medal by the Franklin Institute.
• In 1884, he was awarded the Order of Leopold by Leopold II, King of the Belgians.
• In 1884 and 1889, he received the Order of the Royal Crown of Italy from Umberto I.
• In 1895, he was made a member of France's Legion of Honor.
• In 1897, he was elected an honorary member of the American Society of Mechanical Engineers.
• In 1905, the American Engineering Societies honored him with the John Fritz Medal.
• In 1906, the Berlin Royal Technical University awarded him an honorary doctorate of engineering.
• In 1910, he was elected president of the American Society of Mechanical Engineers.
• In 1911, he was awarded the AIEE Edison Medal.
• In 1913, he became the first American to receive the Grashoff Medal from Germany.
• In 1915, Westinghouse High School, located in Pittsburgh, a mile from his former mansion, was named in his honor.
• In 1918, Solitude, his Pittsburgh home, was purchased by the Engineers Society of Western Pennsylvania and given to the city of Pittsburgh to establish Westinghouse Park. (The mansion was razed the following summer.)
• In 1930, the George Westinghouse Memorial, funded by 50,000 of his employees, was placed in Schenley Park in Pittsburgh.
• In 1932, the George Westinghouse Memorial Bridge was opened in 1932 to carry US Route 30 over the Turtle Creek Valley where his many companies had flourished. Its plaque reads:

• In 1936, the American Society of Mechanical Engineers organized a commemorative forum: Presenting the Career and Achievements of George Westinghouse on the 90th Anniversary of his Birth.
• Since 1953, the American Society of Mechanical Engineers has awarded a George Westinghouse Medal in the power field of mechanical engineering. Since 1972 there has been a gold medal and also a silver medal (for younger engineers).
• In 1986, the George Westinghouse Jr. Birthplace and Boyhood Home in Central Bridge, New York, was listed on the National Register of Historic Places.
• In 1989, Westinghouse was inducted into the National Inventors Hall of Fame.
• December 1, 2018 was declared Westinghouse Park Centennial Day by Pittsburgh Mayor, William Peduto
• In 2019, The Westinghouse Park 2nd Century Coalition was organized.
• In 2021, Westinghouse's 175th birthday (his "dodransbicentennial") was celebrated, Westinghouse Park was certified as an arboretum and also determined eligible for listing on the National Register of Historic Places.
• In 2023, the Westinghouse Legacy 501.c3 organization a 501(c)(3) non-profit, was established to promote the man and his accomplishments. It is building an online archive of information about George Westinghouse and advocating for on-going projects in the Pittsburgh park that bears his name, including the implementation of the city's master development plan for the park and development of long-term program of archeological research.

Timeline

(Adapted from Library of Congress)

• 1846: George Westinghouse born.
• 1865: George Westinghouse obtains first patent for rotary steam engine.
• 1867: Marries Marguerite Erskine Walker.
• 1869: George Westinghouse receives patent for the air brake. Westinghouse Air Brake Company organized with George Westinghouse as president.
• 1872: Automatic air brake invented.
• 1878: First foreign air brake company started at Sevran, France.
• 1881: Westinghouse Machine Company formed. The Westinghouse Brake Company, Ltd., in London, England, founded.
• 1881: The air brake company institutes Saturday half-holiday.
• 1882: Union Switch and Signal Company organized.
• 1884: The Westinghouse Brake Company, Ltd., in Hanover, Germany, founded.
• 1886: Westinghouse Electric Company, later known as the Westinghouse Electric and Manufacturing Company, formed.
• 1889: Ground broken for air brake factory at Wilmerding, PA.
• 1890: Westinghouse began manufacture of electric railway motors.
• 1893: Westinghouse Electric company lights Columbian Exposition in Chicago.
• 1895: Main works for Electric and Manufacturing Company built in East Pittsburgh.
• 1896: Generators built by Westinghouse turn the waters of Niagara Falls into electric power.
• 1898: Westinghouse Company, Ltd., in St Petersburg, Russia organized.
• 1899: The British Westinghouse Electric & Manufacturing Company, Ltd., formed in London, England, with another plant in Manchester.
• 1901: Societe Anonyme Westinghouse organized with offices in Paris, and works in Le Havre and Freinville. The Westinghouse Electricitats-Actiengesellschaft organized in Berlin.
• 1903: Canadian Westinghouse Company, Ltd., founded. Relief Department (disability benefits, medical and surgical services) founded.
• 1904: The American Mutoscope & Biograph Co. films motion pictures of the Westinghouse Works. Louisiana Purchase Exposition held in St. Louis—Westinghouse Co. displays several large exhibits, holds screenings of the AM&B films, and supplies power generators and equipment for the exposition's service plant.
• 1905: Electrification of the Manhattan Elevated Railways and the New York subway system.
• 1907: George Westinghouse loses control of his companies.
• 1911: George Westinghouse severs all ties with his companies.
• 1914: George Westinghouse dies.
• 1918: George Westinghouse receives his final patent, 4 years after his death.

Companies and geographical distribution

During his lifetime, the companies of George Westinghouse were widely distributed in the Pittsburgh region. Their locations, and the locations of several other major industrial enterprises, are numbered in the image and are itemized here:

1. Westinghouse Air Brake: 25th Street and Liberty Avenue
2. Westinghouse Air Brake: Allegheny City
3. Westinghouse Air Brake: Wilmerding
4. Union Switch & Signal and Westinghouse Electric: Garrison Alley
5. Union Switch and Signal: Swissvale
6. First Westinghouse home and gas wells: "Solitude"
7. Haymaker gas wells: Murrysville
8. Other gas wells: Murrysville
9. Fuel gas line: Murrysville to Pittsburgh
10. Edgar Thomson Works of Carnegie Steel: Braddock
11. Carnegie Steel Company: Homestead
12. Westinghouse Electric and Manufacturing: East Pittsburgh
13. Westinghouse Machine Company
14. Westinghouse Foundries: Trafford

Patents

Below is a sampling of U.S. patents for inventions by George Westinghouse. Many of the same inventions were also patented in foreign countries, including Austria, Australia, Canada, Denmark, France, Germany, Great Britain, Spain, and Switzerland. Many additional patents were filed in the names of his companies or various of his engineers. A full list of U.S. patents can be found in Ref.

• U.S. patent 34,605, 1862, grain and seed winnowers; patent awarded to father George Westinghouse Sr.
• U.S. patent 50759A, 1865, improvement in rotary steam-engines; 1st patent awarded to George Westinghouse Jr.
• U.S. patent 61967A, 1867, improved railroad switch and car replacer; device to help put derailed train car back on track
• U.S. patent 76365A, 1868, improved railway frog; device for switching trains between tracksay be
• U.S. patent 88929A, 1869, improvement in steam-power-brake devices; the air brake

• U.S. patent 106,899, 1870, improvements in steam engine and pump
• U.S. patent 109,695, 1870, improvement in atmospheric car-brake pipes
• U.S. patent 144,006, 1873, improvement in steam and air brakes
• U.S. patent 136,631, 1873, improvement in steam-power-brake couplings
• U.S. patent 149,901, 1874, improvement in valves for fluid brake-pipes
• U.S. patent 159,533, 1875, pneumatic pump
• U.S. patent 223,201, 1879, improvement in auxiliary telephon exchanges
• U.S. patent 223,202, 1879, automatic telephone switch for connecting local lines by means of main line
• U.S. patent 218,149, 1879, improvement in fluid-pressure brake apparatus
• U.S. patent 246,053, 1881, interlocking switch and signal apparatus
• U.S. patent 280,269, 1883, fluid-pressure regulator
• U.S. patent 301,191, 1884, system for conveying and utilizing gas under pressure
• U.S. patent 306,566, 1884, means for detecting leaks in gas mains
• U.S. patent 314,089, 1885, system for the protection of railroad-tracks and gas-pipe lines
• U.S. patent 330,179, 1885, means for detecting and carrying off leakage from gas mains
• U.S. patent 342,552, 1886, system of electrical distribution
• U.S. patent 342,553, 1886, induction coil
• U.S. patent 357,295, 1887, commutator for dynamo electric machines
• U.S. patent 366,362, 1887, electrical converter; a type of transformer
• U.S. patent 373,035, 1887, system of electrical distribution
• U.S. patent 357,295, 1888, electric meter (with Philip Lange)
• U.S. patent 399,639, 1889, system of electrical distribution
• U.S. patent 400,420, 1889, fluid-meter
• U.S. patent 425,059, 1890, fluid-pressure automatic brake mechanism
• U.S. patent 427,489, 1890, alternating current electric meter
• U.S. patent 437,740, 1890, fluid-pressure automatic brake
• U.S. patent 676,108, 1890, electric railway system
• U.S. patent 446,159, 1891, switch and signal apparatus
• U.S. patent 454,129, 1891, pipe-coupling
• U.S. patent 499,336, 1893, draw-gear apparatus for cars
• U.S. patent 497,394, 1893, conduit electric railway
• U.S. patent 543,280, 1895, incandescent electric lamp
• U.S. patent 550,465, 1895, electric railway
• U.S. patent 579,506, 1897, current-collecting device for railway-vehicles
• U.S. patent 579,525, 1897, system of circuits and apparatus for electric railways
• U.S. patent 595,007, 1897, elevator
• U.S. patent 595,008, 1897, electric railway
• U.S. patent 609,484, 1898, fluid pressure automatic brake
• U.S. patent 645,612, 1899, method of distributing energy
• U.S. patent 672,114, 1900, draft appliance for railway cars
• U.S. patent 672,117, 1900, draw-gear and buffing apparatus
• U.S. patent 687,468, 1900, draw-gear and buffing apparatus
• U.S. patent 727,039, 1900, automatic fluid pressure brake apparatus
• U.S. patent 773,832, 1903, controlling system for electric motors
• U.S. patent 922,827, 1908, gearing
• U.S. patent 972,421, 1908, turbine
• U.S. patent 1,031,759, 1912, vehicle supporting device; a shock absorber
• U.S. patent 1,185,608, 1916, automobile air spring
• U.S. patent 1,284,006, 1918, automatic train control (filed by his executors)