. American X-ray journal . very low specific gravity(1005) much more current passed whenonly half an inch apart than when thedistance was increased to four inches;between four inches and two feet, how-ever, no appreciable difference could bemeasured. So much depends upon the specificgravity of the electrolyte, that too muchattention can not be given to this amount of resistance offered by theinterruptor can, by varying the specificgravity of the fluid, be regulated to thegreatest nicety, and to such an extent asto render the use of a rheostat unnec-essary. The experiments upon whicht
. American X-ray journal . very low specific gravity(1005) much more current passed whenonly half an inch apart than when thedistance was increased to four inches;between four inches and two feet, how-ever, no appreciable difference could bemeasured. So much depends upon the specificgravity of the electrolyte, that too muchattention can not be given to this amount of resistance offered by theinterruptor can, by varying the specificgravity of the fluid, be regulated to thegreatest nicety, and to such an extent asto render the use of a rheostat unnec-essary. The experiments upon whichthese conclusions are founded were car-ried through with the assistance of C. Yaudry. the managing director ofthe Birmingham Electric Supply Com-pany who kindly placed ; at my disposala voltmeter and ammeter of exquisitesensitiveness. The experiments were made with anominal no volt circuit, which at thetime was supplving a regular flow of 119volts. The arrangement of the apparatusduring the experiments will be under-. Fig. 3. stood by reference to the diagram (). The voltage of the current passingthrough tiie primary of the coil was mea-sured by the drop which was registeredacross the interruptor. The vessel containing the interruptorwas large, and contained 200 ounces ofsolution. The platinum wire was , and half an inch was lead plate was 16 square inchesand the distance between the electrodeswas 3 1-2 inches. In the measurements here recordedthe rheostat was entirely cut out of cir-cuit, the full 119 volts being passedthrough the interruptor. With plain water, specihc gravity 664 THE AMERICAN • iooo. the ammeter failed to give anyreading, so that less than a quarter ofan ampere passed. The voltage acrossthe interrnptor showed a drop to 115,thus 4 volts passed through the coil,*which gave a spark of only half an inchin length. The platinum wire in the in-terrnptor gave off but a few bubbles anddid not become red hot. Half an ounceof pure sulph
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