|
|
|||||||||||||||||||||||||||||||||||||||||||||||||
![]() |
||||||||||||||||||||||||||||||||||||||||||||||||||
What's Old
|
||||||||||||||||||||||||||||||||||||||||||||||||||
Have you heard of Douglas McDonald Perham and his Cavalcade of Electronics? Mr. Perham, born on May 22, 1885, in Duarte, California, was a trailblazer in the development of early radio and electronic technologies. His life and work not only advanced the fields of communication and electronics but also laid the foundation for preserving the history of these transformative technologies. Growing up in Southern California during the late 19th century, Perham developed an early fascination with electricity and mechanics. This passion led him to pursue studies in electrical systems during a period when wireless communication was emerging as a revolutionary technology. His natural aptitude for engineering and his hands-on experimentation with early electrical devices positioned him to play a pivotal role in the industry. In 1905, Perham began his professional career at the Federal Telegraph Company (FTC) in Palo Alto, California. FTC was instrumental in advancing long-distance wireless communication, particularly through its use of the Poulsen arc transmitter. What's OldA collection of many early mercury rectifiers. In top row, partially hidden by cabinet upright, is a three-part rectifier patented by Steinmetz in 1915. This exhibit was built by Ralph Heintz in 1928. It was to be used as evidence in a patent suit to show that the Heintz-Kaufman circuit was not the same as de Forest's and that at least four other researchers had produced oscillations with a three-element tube before de Forest. By Dick Barrett All the items shown are exhibits at the Cavalcade of Electronics, a collection of electronic equipment housed in one wing of the Perham Foundation's exhibit at New Almaden, California. A number of other exhibits appeared on page 35 of the August 1962 issue.
This original de Forest triode was made in 1906. De Forest wrote in a letter in 1959: "Among the really rare relics you will see there [Perham Foundation exhibit] is one of the original three-electrode cylindrical-shaped tubes with a screw base." Douglas Perham holds early Farnsworth CRT. It was fabricated from a chemist's flask, the fluorescent screen being painted on the bottom and the electron gun welded into the neck. |
||||||||||||||||||||||||||||||||||||||||||||||||||
![]() |
||||||||||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||||||||