Museum Homepage

The San Mateo County Historical Association
Online Collections Database

The mission of the San Mateo County Historical Association is to inspire wonder and discovery
of the cultural and natural history of San Mateo County.


Items with Images Only

Search Hints: To search by phrase wrap your criteria in quotes. ex: "Find me"

2699 results found. Records searched: 2699

Image of 2015.012.002 - General Electric Electron Beam Generator Electron Tube, 1957. This electron accelerator beam tube was stored for use as spare parts for "Beam 1", the first electron beam generator produced by General Electric for the Raychem Corporation. "Beam 1" was used by the Raychem Corporation in Menlo Park, California, and later by Tyco Electronics when it bought Raychem in 1999. It was the first electron beam accelerator ever put into commercial use. "Beam 1" was still in operation until 2016.

The appearance of the electron tube is that of a long metal cylinder that extends into a ridged triangular cone. The cone connects to a rectangular titanium window at the base. Approximately 40" of the top of the tube is constructed with a cylindrical piece of translucent material with 11 equally spaced black enamel metal rings. The ridged triangular section near the base is 35" long and 19" wide. Additional hardware is attached near the middle of the tube and to the side of the triangular section.

An excerpt from General Electric Product Data Sheet A4610, August 1959 describes the Electron Tube. This datasheet is for a slightly later model that is of similar design to this artifact:
"ELECTRON TUBE - Permanently evacuated; multi-section construction. Electron beam emitted by hot tungsten filament; biased grid allows tube to conduct only during high-energy portion of input cycle. Electrons accelerated by voltage applied to intermediate electrodes…emerge through permanent window to treatment area.  /  Tube Window - 3 x 15". Made of titanium, 0.0075" thick. Cooled by forced air. Air-cooling nozzle included. (Compressor must be purchased seperately...must meet specifications appearing under AIR REQUIREMENTS-TUBE WINDOW  COOLING.)  /  Electrically controlled, air-operated, water-cooled shutter - for absorbing beam when bombardment of material in beam area is not desired, or for timed exposures."

2015.012.002 - General Electric Electron Beam Generator Electron Tube, 1957. This electron accelerator beam tube was stored for use as spare parts for "Beam 1", the first electron beam generator produced by General Electric for the Raychem Corporation. "Beam 1" was used by the Raychem Corporation in Menlo Park, California, and later by Tyco Electronics when it bought Raychem in 1999. It was the first electron beam accelerator ever put into commercial use. "Beam 1" was still in operation until 2016. The appearance of the electron tube is that of a long metal cylinder that extends into a ridged triangular cone. The cone connects to a rectangular titanium window at the base. Approximately 40" of the top of the tube is constructed with a cylindrical piece of translucent material with 11 equally spaced black enamel metal rings. The ridged triangular section near the base is 35" long and 19" wide. Additional hardware is attached near the middle of the tube and to the side of the triangular section. An excerpt from General Electric Product Data Sheet A4610, August 1959 describes the Electron Tube. This datasheet is for a slightly later model that is of similar design to this artifact: "ELECTRON TUBE - Permanently evacuated; multi-section construction. Electron beam emitted by hot tungsten filament; biased grid allows tube to conduct only during high-energy portion of input cycle. Electrons accelerated by voltage applied to intermediate electrodes…emerge through permanent window to treatment area. / Tube Window - 3 x 15". Made of titanium, 0.0075" thick. Cooled by forced air. Air-cooling nozzle included. (Compressor must be purchased seperately...must meet specifications appearing under AIR REQUIREMENTS-TUBE WINDOW COOLING.) / Electrically controlled, air-operated, water-cooled shutter - for absorbing beam when bombardment of material in beam area is not desired, or for timed exposures."

Record Type: Object