Making the Perfect Record: From Inscription to Impression in Early Magnetic Recording

Loud, Clear, Reliable Sound

David Morton (2000, 112) also writes that “without any electronic signal amplification, the telegraphone could not adequately record the weak currents of a long-distance transmission.”

(This note comments on the page titled, "Faith in the Device," as well as the attached image titled, "De Forest's 20th-Century Triode or Audion Amplifier (1907).")

This page has paths:

This page references: