Edison Patent Model Lamp No. 8
Lamp label - No. 8 (early)
Lamp label - Unmarked
Lamp label - Unmarked (near plaster ring)
Lamp No. 8 - Patent Model Exhibit No. 8, (NA-faded), and (NA-faded)
"U.S. Patent Office Declaration of Interference, Sawyer and Man vs. Edison"
Lamp 8 is an Edison Patent Model with a coiled filament made of bamboo, not carbonized, but rubbed with lamp black. This lamps was made at Edison's laboratory in Menlo Park in 1881 for Edison's legal defense in the Patent Interference Declaration issued by the Patent Commissioner on September 23, 1880 against the Sawyer and Man lamp. Note the importance of this lamp is marked by four labels, three are exhibit labels.
The rarity of this lamp is unsurpassed. It has a "spiral" filament shape made at a time when Edison had already moved on to his famous bamboo "horseshoe" and "hairpin" shaped filaments. This lamp was made strictly as a Patent Model, the spiral bamboo being only blackened with soot, not carbon
This Edison lamp has four paper labels. The label located near the evacuation tip (tit) is a quartered court square with a hand written "8" in the center, the number coinciding with its position in the pigeon hole compartments of the wooden box. The older courtroom exhibit labels are located nearer the base of the lamp and are marked in dark ink with the number "8" and two others with faded missing numbers.
NOTE: the lamp globe still shows glue marks where other labels were once fastened
Lamp label - No. 8