| Manufactured by General
Electric, this Coolidge tube was used for diagnostic x-rays and is
a high vaccum tube. It measures 21 1/2" long and 7" in diameter. This tube
dates to around 1917 - 27, as the evacuation nipple is present. The purple
tint of the glass indicates the presence of potassium in the glass. The
anode is to the right and shows damage
from the electron beam. The cathode to
the left. The high voltage connection on the anode is somewhat unusual.
The electrical connection on the cathode is a srew-cap
This tube was purchased in 1936 at the cost of $40.00.
|"Patented Jan 31 '11 Feb 27 '12 Dec 30 '13 May 12 '15 Oct 30 '16 jan 2 '17 Patents Pending This tube is not licsensed to be re-exhausted or repaired, nor is the metal therein contained licsensed to be used except in this particular tube. General Electric Co. Schenectady N.Y. U.S.A."|
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