Christie, Arthur Carlisle, 1879- · Philadelphia ; London : Lippincott · leaf 43
erse currents bands of equalor unequal length will be seen at both ends. 30 A MANUAL OF X-RAY TECHNIC Inverse currents may be prevented from enteringthe tube by introducing a spark-gap of such lengththat the make current is too weak to pass it. Another method is to use the ventril or valve tubeof… … Fig. 13.—Valve tube. As stated above, the secondary of the inductioncoil consists of many windings of very fine wire some-times ten miles or more in length. It is usually woundin sections and these subsequently assembled. All thelayers of the coil must be thoroughly insulated, eachfrom the other.…
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