ALS signed “Edison,” one page, 8 x 10.5, New Jersey and Pennsylvania Concentrating Works letterhead, no date. Letter to "F.L.P.," probably Frank L. Perry, who was a journalist for the trade periodical Western Electrician. In full: "See 'Loud Speaking Telephone' in Prescott's work on Elec. & other works on telephony. The apparatus is not only useful for telephones but for other things it has no 'self induction' and would record attenuating waves absolutely true up to 100,000 per second." In very good condition, with creasing, soiling, and light show-through from old tape repairs on the reverse. Edison refers to the works of George B. Prescott, an American electrical engineer who wrote several books on the history of electricity, including an 1877 work entitled 'Electricity and the Electric Telegraph' and an 1878 work entitled 'The Speaking Telephone, Talking Phonograph and Other Novelties.' In 1879, Edison invented a new telephone receiver with a carbon-button transmitter and an electromotograph receiver that would be dubbed 'The Edison Loud Speaking Telephone.' A fabulous, early letter concerning a tremendous technical innovation.
This item is Pre-Certified by PSA/DNA
Buy a third-party letter of authenticity for
$150.00
*This item has been pre-certified by a trusted third-party authentication service, and by placing a bid on this item, you agree to accept the opinion of this authentication service. If you wish to have an opinion rendered by a different authenticator of your choosing, you must do so prior to your placing of any bid. RR Auction is not responsible for differing opinions submitted 30 days after the date of the sale.
We use cookies on this site to improve your experience. By using this site, you accept our use of cookies. To learn more, please see our Privacy Policy.
