. Practical electricity in medicine and surgery. current; as it isturned around on the index scale the resistance is diminished,until with the pointer way round the circle all resistance is outof the circuit. At 3 and 4 are the wires which run to the instru-ment in use, as, for instance, the laryngoscope at L. By asimple spring-clamp they are put on or removed in an instant. S is a metallic tubular reservoir about one metre in height,also shown in cross-section. This is filled with four litres of * A storage battery would be more efficient and convenient. ELECTRIC LIGHT AS AN AID IN DIAGNOSIS.
. Practical electricity in medicine and surgery. current; as it isturned around on the index scale the resistance is diminished,until with the pointer way round the circle all resistance is outof the circuit. At 3 and 4 are the wires which run to the instru-ment in use, as, for instance, the laryngoscope at L. By asimple spring-clamp they are put on or removed in an instant. S is a metallic tubular reservoir about one metre in height,also shown in cross-section. This is filled with four litres of * A storage battery would be more efficient and convenient. ELECTRIC LIGHT AS AN AID IN DIAGNOSIS. 211 cool water. A heavy leaden weight or plunger (ten kilos), bg,is swung from the under surface of the cover by pulleys, ro ;the cord attached to the little handle, gr, serves to hoist it; hois a closely-fitting piston having a valve, ve, which allows theweight to be raised, but causes it to rest on the surface of thewater, which, by its weight, is driven up through sr\ its flowbeing checked or regulated by the stop-cock,/, at its upper Fig. 109.—Combined Battery and Hydrostatic Apparatus. Water being thus caused to flow, passes around the rheostat andthrough the tube, 7i, by flexible-rubber tubes into the instrument,around the heated wire, back through the tube h at m, where itdrops back into the reservoir at tr, and can be used over andover again. With proper adjustment the weight need not beraised oftener than once in twenty minutes, but the water must 212 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. be kept steadily flowing, or there is danger to the p is a metal loop in which the tubes and wires may rest sothat their weight is hardly noticed. At / / are handles by winchthe whole instrument can be moved about as desired.*
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
