. 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 \2- 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 [2-inchcoil is about 100 feet long, in the secondary about 28 miles long. Thewin- in the primary of an [8-inch coil is about [40 feet, and in the sec-ondary 38 miles long. X-RAY MACHIXES 29. Fig. 27. One-cell rectifier.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1913
