. Elementary and dental radiography . )l)en it the core were wound with uninsulated wire. If this were donethe current would not follow tlic windings oi the wire at all. Init the shorter path oi less resistance, passing along the iron core,making a short circuit.) ( )ver the ])riniary winding is placed a heav_\insulation of mica or vidcanite, and around this is wound more insulatedwire, the secondar\- winding, (higs. 32 and 33.) There is positivel\- no electric connection between the primary andsecondary windings. The ]Mimary current passes through the primary 2S ELEMENTARY RADIOG

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. Elementary and dental radiography . )l)en it the core were wound with uninsulated wire. If this were donethe current would not follow tlic windings oi the wire at all. Init the shorter path oi less resistance, passing along the iron core,making a short circuit.) ( )ver the ])riniary winding is placed a heav_\insulation of mica or vidcanite, and around this is wound more insulatedwire, the secondar\- winding, (higs. 32 and 33.) There is positivel\- no electric connection between the primary andsecondary windings. The ]Mimary current passes through the primary 2S ELEMENTARY RADIOGRAPHY winding and into the negative lead wire. But in its passage it has in-duced or created a secondary current in the secondary winding. Coils are rated and designated according to the maximum num-ber of inches of atmosphere the secondary current can be made to the current jumps from one terminal to the other of the secondarywinding, a spark occurs, due to the resistance of the atmosphere to the :n B t ,.E. 4 A

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