[PT031AAQ], Patent Caveat, Thomas Alva Edison, September 9th, 1888

Item

Abstract

DRAFT CAVEAT (12 pgs; multiple subjects): phonograph (cutting cylinder grooves); string telephone; putting sound recordings on a thread(?); disk phono (auto regulating for surface velocity) [ie radial velocity]; various recording or reproducing points/diaphragms; governor; phono motor regulation; water motor & governor; glycerine dashpots?; "false shell for big cylinder"; other forms of cylinder "shells"; "wire wound oxidized iron wire armature pressed [illeg] like by hydraulic pressure, ditto short pieces of wire with Sol Ammoniac sol ditto iron turnings, then shellaced or japanned to stop furthuer oxidation; Diaphragms [p. 10] "Mica, Stell, phos benzo, Laminated steel phos bron, brass, glass, celluloid, also hard rubber, shellaced cloth, asphalted cloth, cork,"

Date

1888-09-09

Decade

1880-1889

Identifier

PT031AAQ

Folder Set

PT031AAQ

Title

[PT031AAQ], Patent Caveat, Thomas Alva Edison, September 9th, 1888

Microfilm ID

113:874

Publisher

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