. Elementary and dental radiography . Fig. 25. Fig. 26. Fig. 25. A, movable arm with fulcrum at B. C, electro-magnet. D, break. E, 26. A, piece of ribbon steel. B, point where circuit is broken. C, 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. Thelarger the coil the longer the spark gap. From 6-inch to as high as 40-inch coils are manufactured. From 8-inch to about 18-inch coils are thesizes generally used.
. Elementary and dental radiography . Fig. 25. Fig. 26. Fig. 25. A, movable arm with fulcrum at B. C, electro-magnet. D, break. E, 26. A, piece of ribbon steel. B, point where circuit is broken. C, 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. Thelarger the coil the longer the spark gap. From 6-inch to as high as 40-inch coils are manufactured. From 8-inch to about 18-inch coils are thesizes generally used. The wire of the primary winding is from 12- to 8-gauge; of the sec-ondary from 34- to 29-gauge. The length of the windings varies accord-ing to the size of the coil, of course. The wire in the primary of a 12-inchcoil is about 100 feet long, in the secondary about 28 miles long. Thewire in the primary of an 18-inch coil is about 140 feet, and in the sec-ondary 38 miles long. X-RAV MACHINES 29. Fig. 27. One-cell rectifier.
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