In May of 2000 the writer obtained a copy of the inventory of the Hammer lamp collection at the Henry Ford & Greenfield Village Research Center in Dearborn, Michigan. A transfer number had been assigned to each lamp in 1930. In the listing given in Section 12 of this website these transfer numbers are used. Similar numbers are used in Volume 5 of The Papers of Thomas A. Edison. However, it should be pointed out that the numbers that appear in Volume 5 are somewhat different - and yet, are the same. An example is given below where the numbers and lamp descriptions from the two sources are compared:
It is the number "122" that identifies these descriptions as referring to the same lamp.The Papers of Thomas A. Edison, page 1051, 1880 lamp 29.1980.529.122. Lamp made for Menlo Park street lighting, with paper horseshoe filament, large globe, supplemental tip, round inside seal, and platina vise clamps.
This website, Section 12 1880-122-----Edison. Paper horseshoe carbon filament lamp, large globe, supplemental tip, round inside seal, platina vise clamps. Made for Menlo Park street posts.
Reference
1) The Papers of Thomas A. Edison - Research to Development at Menlo Park, January 1879 - March 1881, The Johns Hopkins University Press, Baltimore and London, 2004, pp 1049-1056.