Expt 5: Not completed but similar to #4. Using special lamp made by Boehm on top of spark gauge; just got as far as heating it on pump.

Jehl, Francis

1880-07-07

1880-1889

Technical Note

Incandescent lamp

Vacuum and glass bulb

N104007

N104

[N104007], Technical Note, Francis Jehl, July 7th, 1880

36:270

Thomas Edison National Historical Park

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