Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 124
e vacuum more permanent and less liable toalteration, various methods have been used. The most obviousis to increase the size of the tube so that the removal ofsmall quantities of air will not appreciably alter the pressure.Another method is to add a subsidiary anode, which enablesthe tube to take… … Fig. 33.—Focus Tube (Bianodic). made tube of this type is very strong, and will last a longtime. Wherever X ray apparatus is in constant use, as in theLondon hospitals, these tubes are the ones most generally em-ployed. Their average life is somewhere about three months.Many radiographers consider…
X-rays
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
