. Elementary and dental radiography . y desired strength, usually from 100 to 125volts. The commercial is either 60 or 133-cycle. usually 60. Since the ])rinciple involved in the transformer is quite similar tothe one met with in X-ray machines a description of it would not be outof place in this work. Fig. 10 shows the plan of construction of atransformer. A represents an ircn core, around which is wrapped insu-lated wire. This is the primary winding through which passes the pri-mary current at the high voltage of from 1,000 to 3,000. As always, depends on the size of the wi
. Elementary and dental radiography . y desired strength, usually from 100 to 125volts. The commercial is either 60 or 133-cycle. usually 60. Since the ])rinciple involved in the transformer is quite similar tothe one met with in X-ray machines a description of it would not be outof place in this work. Fig. 10 shows the plan of construction of atransformer. A represents an ircn core, around which is wrapped insu-lated wire. This is the primary winding through which passes the pri-mary current at the high voltage of from 1,000 to 3,000. As always, depends on the size of the wire. P) represents another iron 12 ELEMENTARY RADIOGRAPHY core, around which is also wrapped insulated wire. This is the secondarywinding, through which the secondary current passes. C shows softiron connections between the two cores. When the electric current is established in the primary winding acurrent is set up or induced in the secondary winding. Bear in mindthere is no electric connection between primary and secondary Fig. 11. A Transformer. The primary current enters, and leaves unaltered except for a slight lossin amperage, but in its passage it induces a current in the secondary. If the wire used in the secondary winding be of the same length andsize as that used in the primary winding, the induced secondary currentwill be of practically the same voltage and amperage as the primary cur-rent. But if the wire in the secondary be shorter and larger, the inducedcurrent will be lower in voltage and higher in amperage. Or if thewire of the secondary winding be longer and smaller than the wire inthe primary winding, the induced secondary current will be higher involtage and lower in amperage than the primary current. The wattagesof the primary and secondary currents remain practically the same. Forexample, suppose the voltage of the primary current is i,ooo, the am-perage 5, the wattage would be 5, Suppose now, by means of the ELECTRICITY 13 transformer, the v
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