Have been experiementing with Rubber tubing with wire spiral for your Telephone tube. The rubber tube is inclined to kink & close the passage. We are making a special article for the purpose by building up a wire spiral. Will send sample in few days which is made & will require time to thoroughly dry.

Sawyer, William H

Phillips, Eugene F

Edison, Thomas Alva

1878-07-11

1870-1879

Letter

Cellulose, resins, and related products

D7838ZDG

D7838

[D7838ZDG], Letter from William H Sawyer, Eugene F Phillips to Thomas Alva Edison, July 11th, 1878

19:735

Thomas Edison National Historical Park

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