The Radio Robot. Ralph Stair of the Bureau of Standards has invented the Radio Robot, an electrical and mechanical trouble-shooter for radio receiving data. It is almost a human detective in finding radio troubles, testinng and "pepping up" vacuum tubes, testing radio parts and complete receiving sets, both alternating-current and direct-current and is a portable power pack
Summary
Public domain photograph of stairs, steps, free to use, no copyright restrictions image - Picryl description
Tags
Date
01/01/1929
Contributors
Harris & Ewing, photographer
Location
Source
Library of Congress
Copyright info
No known restrictions on publication.