Edison's Electric Light and Power System

Photo credit: Richard Warren Lipack / Wikimedia Commons. First page of The Edison Electric Light Company "First Bulletin" dated January 26, 1882. This initial page represents a consecutive five bulletin run that the Edison company produced internally for it agents and employees.

Photo credit: Richard Warren Lipack / Wikimedia Commons. Page two and three of The Edison Electric Light Company February 1882 company bulletin revealing insight into the world's first Edison electric incandescent lighting system on land, installed at the Hinds, Ketcham & Co. printing and lithography establishment in NYC and operating as of January 1881.

Photo credit: Richard Warren Lipack / Wikimedia Commons. The evolution of Edison's incandescent electric light bulb and socket - 1880-1881. Left to right: First form "1880 Wire Terminal Base" socket and bulb as used on the S.S. Columbia - first commercial installation of Edison electric lighting system; Second form "1880 Wire Terminal Base" socket and bulb; "1880 Original Screw Base" socket and bulb and the "1881 Improved Screw Base" socket and light bulb.

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Edison's Jumbo dynamo. Courtesy: National Park Service, Edison National Historic Site.

Edison's Dynamo

Photo credit: Richard Warren Lipack / Wikimedia Commons. Detail of original chandelier with first form "1880 Wire Terminal Base" sockets and incandescent lamps behind "Edison Pioneer" C. E. Estabrook.

The very first Edison electric incandescent light installation took place on the ocean going vessel the S.S. Columbia in 1880. This installation employed use of a first form "1880 Wire Terminal Base" socket and bulb. At first the electrical sockets were connected to a threaded tobe that carried the two electrical wires in to the wood and metal fitted socket, but the intense vibration caused by the 'tight waist' "Mary Ann" Edison dynamo powering the incandescent lights witnessed the bulbs themselves to eject from the socket. To alleviate this problem, Edison electrical engineers best decided to let the socket and bulb assemblies dangle by their loose wires as opposed to the more fixed threaded mount initially employed.

The very first installation anywhere of the Edison electric incandescent lighting system on land took place at the Hinds, Ketcham & Company printing and lithography offices at 449 Water Street, New York City in 1881.

This first land installation fulfilled a desire by the Hinds, Ketcham & Company operators to be able to match colors between color samples accurately with that of finished printed work. The company successfully found that incandescent lighting increased production. The February 1882 issue of The Edison Electric Light Company in-house bulletin revealed this notion in a February 23, 1882 letter from Hinds, Ketch & Company to The Edison Electric Light Company, which had stated as follows;

"New York, February 23, 1882. THE EDISON ELECTRIC LIGHT CO; - DEAR SIRS - - We have had the Edison system of incandescent electric lighting in our factory buildings since January, 1881, and take great pleasure in testifying to its perfection, simplicity, and the many other good features it possesses.

We have found it to be entirely free from all the faults and objectionable features of other artificial lights, and is the best substitute for daylight we have ever known and almost as cheap. Very truly yours, Hinds, Ketcham & Co."

It is interesting and significant to note how these two pages found in The Edison Electric Light Company's February 1882 issue of their company "Bulletin" wholly reveal and document a most candid, concise and specific historical record of the first land installation of electric incandescent lighting in the world.

Thomas Edison’s subsequent development of electric power and light distribution on land, introduced later in 1882, consisted of a large central power plant with its generators (called dynamos), voltage regulating devices, copper wires connecting the plant to other buildings, the wiring, switches, and fixtures in the interiors of those buildings, and the light bulbs themselves. At New York City’s Pearl Street station, where it was first installed, Edison’s team designed a huge dynamo—the largest ever built—which they nicknamed the Jumbo, and built six of them for the Pearl Street station. Each Jumbo weighed about 27 tons and had a 10-foot armature shaft and an output of 100 kilowatts. Each dynamo was driven by a steam engine, which received steam from boilers located in another part of the plant. The Pearl Street plant was designed to run up to 1,400 lamps (light bulbs inserted into fixtures) continuously, and served an area of about one square mile.

A lamp used at the historic 1879 Christmas Eve demonstration of the Edison Lighting System in Menlo Park, New Jersey. Courtesy: The Henry Ford Museum and Greenfield Village.

Customers were connected to the station by thick copper wires run inside tubes called conduits. Edison believed that running wires overhead on poles might be dangerous, and doing so would put electric power in competition with the dozens of telephone and telegraph wires already darkening the New York skies. He decided to put the wires underground. The insulation for the wiring had to be carefully applied, and the streets dug up to install the conduits. At first, Edison used two copper wires to distribute electricity, but the cost of the heavy wires would contribute to the plant’s inability to make a profit for the first five years of its operation. In later installations, Edison adopted a three-wire system that allowed the use of thinner wires, which saved some of the expense of the copper.

From his customer’s point of view, the most important part of the system was the light bulb. While Edison is often remembered as the inventor of the light bulb, there were several incandescent bulbs before his and the principle of incandescence had been known for decades. Edison did, however, achieve a long-lived, practical bulb. The problem with the earliest incandescent bulbs was that the metallic filament within the bulb would become too hot and melt. Edison found that a filament made of a loop of carbonized thread did not melt. This new design offered long life, high electrical resistance (for efficiency), and a pleasing soft light. Along with another key innovation, the improved vacuum pump, Edison was able to construct his first practical incandescent bulb in late 1879.

Pearl Street Station

With the initial Pearl Street installation a success, Edison began building systems in other places. The next two were Brockton, Massachusetts and Sunbury, Pennsylvania. The small Sunbury plant, which powered a maximum of just 400 lamps, used overhead wires on poles to save money. This pattern would continue, with large city centers served by underground conduits and smaller towns receiving the unsightly but inexpensive overhead wires.

There were many technical changes in later Edison power plants. Although he continued to support the use of direct current (DC) for some years, when the new General Electric Company was formed from the Edison Electric Illuminating Company and others, it quickly adopted the more efficient alternating current (AC) technology. However, the basic system of large central stations distributing power over a broad area remained, as did the basic uses for electricity, especially the familiar light bulb.

Further Reading

For more information on the history of the electrification of New York City, Joseph Cunningham’s book, New York Power, is available for purchase from Amazon.com