Christie, Arthur Carlisle, 1879- · Philadelphia ; London : Lippincott · leaf 28
oabout one-millionth of an atmosphere. The essentialparts of the tube are the cathode, the anti-cathode ortarget, the accessory anode, and some device to regu-late the vacuum (Fig. 9). The cathode of a focus tube is made of aluminum,because this metal does not suif er disintegration withconsequent… … Fig. 8.—Jacksons focus tube. As tubes are now constructed, the target is alwaysan anode of the tube, but it is not necessarily so. Thetarget is usually made of platinum, because the intense
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