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Description: | E EKCO electronics (printed on a green, black and silver self adhesive label stuck to the bakelite base). Type EW.3H. Operate at 560 volts NO. NE.225B (typed on white paper label stuck to the bakelite base). Hunterian Museum G.1988.54 (typed on a self adhesive label, removed) MANU E.K. Cole, Ltd 1961 EKCO Works, Southend-on-sea, Essex, England. DES after TROST,A. circa 1935 Germany DES after GEIGER,Hans,Wilhelm,Professor and MULLER,Walther. 1928 Keil University Germany This is a scintillation or gas proportional Geiger-Muller counting tube. The anode is a tungsten wire stretched the length of the tube. The cathode is a thin aluminium tube which sits inside a composite aluminium and glass tube. The end of the tube is closed with a thin glass window (see interference patterns) held in place by a hard wax and the crimped end of the outer aluminium tube. The window is protected by an aluminium reinforced rubber cap which is removed when the tube is in use. This is a mixed polyatomic gas filled tube with an operating voltage of 640V. 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'. | 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 |
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