. American X-ray journal . rrent. In thiscase the necessary resistances for regula-ting the strength of current must beinterposed in the circuit. The currentof the apparatus should be directlybranched off from the main circuit andbe provided with needful resistances are arranged so that afixed resistance remains constantly inter-posed, and second resistance is adjustablefor regulating the tension at for instance, if we use the one in a disk, and the discharge from thetwo terminals is vastly different fromthe discharge of the Rumkorff coil orTeslas transformer. Suc
. American X-ray journal . rrent. In thiscase the necessary resistances for regula-ting the strength of current must beinterposed in the circuit. The currentof the apparatus should be directlybranched off from the main circuit andbe provided with needful resistances are arranged so that afixed resistance remains constantly inter-posed, and second resistance is adjustablefor regulating the tension at for instance, if we use the one in a disk, and the discharge from thetwo terminals is vastly different fromthe discharge of the Rumkorff coil orTeslas transformer. Such apparatus isnot only portable, but can be attachedto any lamp socket, either in the physi-cians office, the ward of a hospital, orcarried in a buggy, and attached to thealternating current socket in the pa-tients room, but if necessary, a storagebattery may be employed. The alterna-ting current can also be used in con-nection with a Static machine and amotor, but in such cases the direct cur-rent ^ives more hundred ten V. current from street cir-cuit, the control of the voltage may bedone by the interposed ten or morethirty-two candle power incandescentlamps, placed in series, reinforced by asliding Rheostat. This gives amplepower, and prevents a side variation. If our lighting circuit supplies analternating current, the use of a newcoil consisting of two separate seconda-ries with their primaries connected inseries, is recommended. Each such sec-ondary must have a high and low poten-tial terminal, due to position and methodof winding. The secondary is wound Static Machine. LESSON the discovery of static elec-tricitv was made by Guericke in 1671,and the treatment with static electricityrecorded in 1750 and brought to Americain 1752 by Franklin, more than two cen-turies ago, yet, it appears to have sharedthe common fate of most discoveriesmade before their time, and to have inmain been forgotten. It has alwaysbeen considered natural that electricity
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