Yamaha Motor Corporation

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Thomas Edison Light Bulb

Tar-putty lamps, made in the spring of 1890 by Edison's key witness, John W. Howell, made specifically as exhibits in the famous Edison patent suit. Labels - each X'ed out number matched to Deshler testimony from Transcript, Volume V, starting pg. 3505.

Edison patent models with coiled filament made of bamboo, not carbonized, but rubbed with lamp black, made at Edison's laboratory in Menlo Park in 1881 for Edison's legal defense in the Patent Interference Declaration issued against the Sawyer and Man lamp by the Patent Commissioner on September 23, 1880.

Maxim lamps and specimen with International Electrical Exhibition label, hand written by William H. Meadowcroft, "Maxim Lamp Rec'd from Hiram S. Maxim nov. 1880" of card stock with string fastener.

Swan lamp made prior to EdiSwan collaboration by Sir Joseph Swan, circa 1884 - made for spring-clip socket invented by Joseph Swan's Chief Engineer, Henry Edmunds, see Edmunds U.S. Patent 288,217. Maxim U. S. Patent 230,310, Defendant's Exhibit, Commissioner's Decision. - Ex parte Maxim. Additional published reference, to Lamp 16 - "Edison's Electric Light, Biography of an Invention" ­ R. Friedel, P. Israel and B. S. Finn, Rutgers University Press, 1985/87 p.194;"Evolution of the Electric Incandescent Lamp", Franklin Leonard Pope, Boschen & Wefer, 1894, p. 79.

Swan lamp, made for 1881 Paris Electric Exhibition. Only complete 1881 specimen known to exist from Paris Opera Theatre chandelier, with International Electrical Exhibition label, hand written by William H. Meadowcroft, "Swan Lamp & Socket Paris Elec. Exh. 1881 Rec'd fr. H. Edmunds 1881" of card stock with string fastener. Henry Edmunds Proprietor, Swan Patents and Designer of 1881 Paris Opera House Swan 600 lamp Chandelier, Source - "Engineering" (News) 21 October 1881, p. 418.

Lane Fox British Electric Company lamp Earliest exhibited form made for 1881 Paris Electric Exhibition. Only complete 1881 specimen known to exist from 1881 Paris Electrical Exposition. International Electrical Exhibition label, hand written by William H. Meadowcroft, "British Elec. Light Lamp Paris Elec. Exh. 1881 Rec'd fr. Company London Oct. 1881" of card stock with string fastener.

Edison Effect lamp, earliest documented by Edison Pioneer John W. Howell, "used by Edison in 1883 in his experiments on the Edison Effect." Observing what Edison described as his "blue air" phenomena, the perplexing electrical disturbance he first discovered on September 8, 1879 became a focus of experimentation. Frances Upton wrote of this event that day, "The aluminum electrode became bright yellow in the blue light with some green phosphorescence. At one time the yellow electrode could be made to change phase by heating. It would jump over and then dance as if uncertain where to stay after the flame was taken away." Edison then created this center wire anode working model. Eminent Scientist, Sir William Preece, was not to report his own research on the "blue effect" until March 26, 1885 in which he named it the Edison Effect.

Edison "Graphite" lamp, made at Menlo Park, tested by J. W. Howell (opened at tip to extract sample graphite filament for test, marked February 18, 1882 (date etched on globe by J.W. Howell). Additional published reference,"Menlo Park Reminiscences", Edison Pioneer Frances Jehl© , 1936, p.374.

Edison "Twin Hairpin" lamp, treated bamboo carbon filaments connected in series, formed in electric resistance furnace (3,500 deg. C). Became series design to "Edison GEM" lamp (acronym - General Electric Metallized), graphite coating on carbon filament took on metal properties during electric furnace treatment.

Open Lamp Specimen, originally from 600-light Swan Chandelier in Paris Opera Theatre, 1881 Paris Electrical Exhibition. Open lamp specimen gives a rare inside view of intricacies of Swan craftsmanship. International Electrical Exhibition label, hand written by William H. Meadowcroft, "Swan Lamp Buffet, Paris Elec. Exh. 1881, Rec'd fr. H. Edmunds 1881" of card stock with string fastener.

Both loupes were found at the bottom of the wooden box. One is a moulded ebonite bell loupe, with early repair made of brass wire. The other is of ivory of curved cylindrical form with a recessed lens. Both were used no doubt by Howell and the court to examine Edison's Tar-putty lamp filament Exhibits.

Notary for the Court, New York Southern District, signed in countless exhibits for Edison Infringement trials, also conducted and notarized depositions throughout the proceedings. Later, after trials, became Edison's life long personal secretary and publicist, coauthor of biography, "Edison, His Life and Inventions" New York: Harper & Bros., 1910.

British engineer, met Edison in 1877, became Edison European associate, became partner in Swan electric lamp development in 1881, Edmunds designed and installed Swan Opera House Chandelier at Paris 1881 Electrical Exhibition, patented Swan lamp hook socket in 1883 - U.S. Patent 288,217.