Memorandum, September, 1877 motion picture
Summary
Adhered to page 4 is a newspaper article entitled "About Microphone Receivers," dated April 28, 1888.
Memo was possibly inside envelope with "Bell Telephone Company" letterhead, with "Revolving Contact Receiver" written on front.
Lists his latest electrical discoveries and inventions circa 1877, including contact telephone, electric spark telephone, and telephonic transfer.
Tags
Date
01/01/1877
Source
Library of Congress
Copyright info
Public Domain