|
Date: |
|
Description: | Chem,33.15. (in white ) MANU Unsigned. late 19th early 20th century DES after CROOKES,William,Sir. 1878 London. England. DES after GEISSLER,Johann,Heinrich,Wilhelm. 1855 Bonn, Germany. DES after BRAUN,Karl,Ferdinand. 1897 Tubingen, Germany. This hand blown horizontally mounted tubular envelope with a side arm for one of the electrodes is a variant of the Crookes tube. It was designed such that electrons from the cathode pass through the slot in the target and impinge on the slightly off centre screen to form a line of fluorescence. The beam is then deflected by a magnetic field according to the strength and orientaion of the field. N.B. all gas discharge tubes emit X-rays this is because the electrons from the cathode strike the atoms of gas in the tube at high energy levels. The addition of a fluorescent screen was invented by Karl Braun. | 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 |
|
|