Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect . eightlectureson00wall Year: 1903 APPENDIX 165 excursions and records caused by different voltages acting for equal times, and by a given voltage acting for different times. The voltage actually indicated by any given curve or portion of a curve is most readily ascertained by superposing the record upon the record of a ' normal curve,' ^ of the curve described by a known constant taken under similar conditions. The two plates are slipped over each other, with abscissae kept parallel until po
Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect . eightlectureson00wall Year: 1903 APPENDIX 165 excursions and records caused by different voltages acting for equal times, and by a given voltage acting for different times. The voltage actually indicated by any given curve or portion of a curve is most readily ascertained by superposing the record upon the record of a ' normal curve,' ^ of the curve described by a known constant taken under similar conditions. The two plates are slipped over each other, with abscissae kept parallel until portions of the curve under examination coincide with portions of the normal curve at known voltage. Such coinciding parts are equipotential, so that the value on the normal curve gives the value on the curve under inspection. For the more minute analysis of electrometric curves, the student should consult the papers of Burch, Einthoven, and Garten. In many instances the calculated curve appears very different from the original record of the curve described by the mercury column, ^ Fig. 66. Object. Fig. 67.—The primary circuit of the inductorium is completed through the pools pp. The galvanometer is short-circuited through the other pair of pools G G. The level of mercury in the lateral pool, and the length of the semicircular wires, are adjusted so that circuit is completed at G G (, the galvanometer is short-circuited) before circuit is completed at //. On releasing the commutator cradle the weight, W, lifts the two wires from the mercury, breaking first the primary circuit, and subse- quently the galvanometer short-circuit. The time of transfer is thus kept constant. Keys.—For the study of blaze-currents, occasional use has been made of two special keys, modified from the well-known model of the Pohl's commutator, for the purpose of automatically (i) breaking
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