. Archives of physical medicine and rehabilitation . be obtained. By wayof comparison it may be stated that al-though m the case of the hammer break,the frequency may also reach this max-imum value, it IS often as low as 25or 30 per second. The Wehnelt Electrolytic In-terrupter37. To utilize this type of inter-rupter, a vessel containing a 20 percent solution of dilute H ,SO, (specificgravity ) is inserted in the primarycircuit. The positive electrode (theanode) is a platinum point P (), the negative electrode (the cath-ode), a large lead plate L. (Note alsoFig. 37.) With such a devic
. Archives of physical medicine and rehabilitation . be obtained. By wayof comparison it may be stated that al-though m the case of the hammer break,the frequency may also reach this max-imum value, it IS often as low as 25or 30 per second. The Wehnelt Electrolytic In-terrupter37. To utilize this type of inter-rupter, a vessel containing a 20 percent solution of dilute H ,SO, (specificgravity ) is inserted in the primarycircuit. The positive electrode (theanode) is a platinum point P (), the negative electrode (the cath-ode), a large lead plate L. (Note alsoFig. 37.) With such a device, whenthe primary circuit is closed in the usualway, the current is regularly and rap-idly interrupted at the platinum point,provided current conditions are withincertain limits. The amperage, for ex-ample, should not be much below 10nor much above 40 amperes, while withvoltages across the terminals exceeding80 to 1 20 the interrupter will not differences of the order of 60volts are normal. 157 X-RAYS AND X-RAY APPARATUS—ROBERTSON. It is difficult to state with certaintythe exact nature of the action of thistype of interrupter. It is somewhat asfollows: When the current begins toflow, the formation of gas bubbles aboutthe platinum pomt mtroduces an in-sulating layer which soon breaks thecircuit; the of inductancecauses a spark to jump the gap, thusexploding the gases and closing the cir-cuit once more. In some such way aperiodic opening and closmg of the circuit takes place. But the action is com-plicated, the frequency depending onthe amount of inductance and of capac-ity in the circuit, the temperature andthe concentration of the acid, and thesize of the platinum point. By meansof an insulating sheath S, the extent towhich the platinum point is exposed tothe acid can be altered and in this waythe interrupter regulated. Values olthe frequency as high as 1300 or2000 per second may be obtained,while even with heavy currents the fre-quency may not go belo
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