TARGET. Personal & laboratory accounts Aug 1878-Feb 1880. Headings include dynamometer, harmonic dynamo, other dynamos & pat models, electric light experiments, new receivers, photograph building, Charlie's contract, sewing machine motor, electric tramway [1879, fr. 189],
[AB001-F] Account Series -- Personal and Laboratory Accounts
https://edisondigital.rutgers.edu/document/AB001
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Archive.org Viewer, Microfilm Series Reel 87