|
Date: |
|
Description: | TYPE GM4/LB No. 784 VOLTS.1360 WINDOW WEIGHT 7 MG/CM2 G.E.C. MADE IN ENGLAND (printed and written on a black and white decal). MANU General Electric Company Limited of England. circa 1960 Head Office, Magnet House, Kingsway, London, W.C.2, England DES after TROST,A. circa 1935 Germany DES after GEIGER,Hans,Wilhelm,Professor and MULLER,Walther. 1928 Keil University Germany This is a gas proportional Geiger-Muller counting tube. The anode is a tungsten wire stretched the length of the tube . The cathode appears to be the composite brass and glass body tube tube which is nickel plated. The end of the tube is closed with a micro thin rolled metal foil window or aluminium coated mylar (the crystal structure can be seen under the microscope) held in place by a hard wax and the crimped end of the outer bras tube and a steel shim. The window is protected by a cardboard and auminium cap which was removed when the tube was in use. This is a mixed polyatomic gas filled tube with an operating voltage of 1360V. It should be noted that these tubes were hand made and each tube was different requiring individual calibration to determine it's counting charactaristics and it's particular maximum operating voltage. It is not known which gases were used in these commercial tubes but earlier experimental types were evacuated and then filled with argon and alcohol at partial pressures of 10cm and 1 cm of mercury. the poly atomic gas prevented a charge building up on the cathode allowing the tube to operate at higher speeds. This type of tube was called a 'fast counter' although the term is confusing since the actual counting speed of the 'fast counter' was slower than that of a 'slow counter'. The carton is stored on top of SCI:4 | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
|
|