Huh? "The last one made of the spiders whosed a poor vacuum the spark did not jump outside. There was a light pink phosphorescence and the glass had a green phosphorescence." "One of the spiders made sometime ago, its phosphorescence was much brighter, showed a poorer vacuum than the one above."

Jehl, Francis

1880-08-29

1880-1889

Technical Note

Vacuum and glass bulb

N104072B

N104

[N104072B], Technical Note, Francis Jehl, August 29th, 1880

36:303

Thomas Edison National Historical Park

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