mercury-vapor tube

mercury-vapor tube

[′mər·kyə·rē ¦vā·pər ‚tüb]
(electronics)
A gas tube in which the active gas is mercury vapor. Also known as mercury tube.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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My light source is a 7-watt mercury-vapor tube 550 mm long, mounted in an aluminum box along the lower edge of the planisphere.