notes on globe lined inside & coated outside with Pt foil; "Globe lined inside & coated outside with platinum foil The inside part having pitch ball coated with platina on one wire which made contact with inside coating the other wire to be connectec with outside coating." other globes with Pt foil reflectors. Fr 639 "Condenser of tinfoil & mica several [???] 3 to 7 layers foil, fastened with shellac & gum {???] which volitilized & deposited on carbon changing resistance greatly"; globe with revolving magnet outside. Descriptions, but no explanations.

Hammer, William Joseph

1880-12-07

1880-1889

Technical Note

Incandescent lamp

N120256

N120

[N120256], Technical Note, William Joseph Hammer, December 7th, 1880

37:638

Thomas Edison National Historical Park

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University