gas x-ray tube

Datecirca 1907

Inventory Number2003-1-0197b

ClassificationVacuum Tube

Subject

Maker Macalaster-Wiggin Company fl. 1897 - 1916

Cultural Region

Place of Origin

Dimensions0.5 x 0.5 x 95 cm (3/16 x 3/16 x 37 3/8 in.)

Material

Accessoriescloth-insulated cords each with a hook end and a electrode connector end (2); wooden tube clamp; wood pieces (4)

DescriptionA large spherical vacuum tube with a concave cathode and a heavy target with a focusing ring in front. Cathode and target are on same axis. There is an additional anode at a 45 degree angle behind the target, and a side tube with an asbestos regenerator.

This tube came together with 2003-1-0197a.

Signedon tube: MAC/WIG

Inscribedon tube: 51954

FunctionThis is an early x-ray tube that needed a little gas inside to work properly. It consists of a concave cathode where electrons are produced and accelerated towards the target. The concave shape, and the ring in front of the target help focus the electrons on the target, where x-rays are produced. There is a second anode behind the target that was supposed to improve the performance of these early tubes. To restore the optimal gas levels there is a side tube with asbestos that releases some gas when heated.

ProvenanceFrom the Boston Museum of Science.