Christie, Arthur Carlisle, 1879- · Philadelphia ; London : Lippincott · leaf 62
leading-in current enters at H and whenthe movable arm is set on the first contact point thecurrent passes through A, down coil No. 1, up coilNo. 2, down No. 3, and so on until it passes out at B.Shifting the arm to the second point eliminates coilNo. 1 from the circuit and reduces the amount… … Fio. 21.—Rheostat. the current flows directly from H through the mov-able arm to B, the rheostat no longer being in thecircuit. CHAPTER VI. RoNTGENOGRAPHY. The Rontgen ray acts upon sensitized plates likeordinary light, therefore the making of rontgenogramshas much in common with photography. It…
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