[TAE ALS] "Upton: For a special Experiment I want 250 fibres cut of each of following sizes. They are to be sent to Hickmann imediately: 4x11 3x12 without shankes & regular length. Tell Lawson the last carbons in new forms vary in volts very much have low economy & look as if they were not going to make a good record."

Edison, Thomas Alva

Upton, Francis Robbins

Lawson, John W

Hickman, David Kelsey

1888-07-20

1880-1889

Letter

Research and development

Incandescent lamp

X098A027

X098A

[X098A027], Letter from Thomas Alva Edison to Francis Robbins Upton, July 20th, 1888

NMAH Archives Center

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

July 20, 1888