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Description: | WA 1637 (written in black on the glass envelope). Hunterian Museum G.1988.52 (typed on a self adhesive label attached to the carton, removed). 20TH CENTURY ELECTRONICS TYPE M6 NOo WA1637 MAX OPERATING VOLTAGE 1110 MADE IN ENGLAND (on a blue and white self adhesive label on the envelope) MANU 20th Century Electronics Ltd circa 1955 Centronics Works, King Henry's Drive, New Addington, Croydon, Surrey, 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 the aquadag coating on the inside of the tube. This is a mixed polyatomic gas filled tube with an operating voltage of 1100V. 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 envelope is contained within an outer glass shroud. 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 |
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