. Elementary and dental radiography / by Howard Riley Raper . Fig. 25. Fig. 26. Fig. 25. A, movable arm with fulcrum at B. C, electro-magnet. D, break. E, 2fi. A, piece of ribbon steel. B, point where circuit is broken. (, electro-magnet. flow of the current. When we speak of a coil as, say a 12-inch coil, wemean that the spark gap of that coil is twelve inches long; that its sec-ondary current can be made to jump twelve inches of atmosphere. Coilswith parallel spark gaps from as narrow as about 6 inches to as long asabout 40 inches have been manufactured. The induction coils manuf
. Elementary and dental radiography / by Howard Riley Raper . Fig. 25. Fig. 26. Fig. 25. A, movable arm with fulcrum at B. C, electro-magnet. D, break. E, 2fi. A, piece of ribbon steel. B, point where circuit is broken. (, electro-magnet. flow of the current. When we speak of a coil as, say a 12-inch coil, wemean that the spark gap of that coil is twelve inches long; that its sec-ondary current can be made to jump twelve inches of atmosphere. Coilswith parallel spark gaps from as narrow as about 6 inches to as long asabout 40 inches have been manufactured. The induction coils manufactured today usually have a spark gapof from 8 to 12 inches. (See pages 43 and 44.) The wire of the primary winding is from about 16- to 4-gauge; ofthe secondary from about 34- to 29-gauge. The length of the wire in thesecondary is immensely greater than the length of the wire in the primary. X-RAY MACHINES 29. Fig. 27. One-cell rectifier.
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