. An elementary manual of radiotelegraphy and radiotelephony for students and operators . nd connect the standaidcondenser across any fraction, II, of this resistance, and thenconnect the condenser immediately afterwards with the galvano-meter, and observe the throw. Perform the same exj)erimentwith the other condenser, and vary the resistance between theterminals of the condenser, so as to find by trial the value it musthave in order that the throws may be the same in the two calling the two resistance values It and K, and the twocapacities C and C, the capacities are inversely pro
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . nd connect the standaidcondenser across any fraction, II, of this resistance, and thenconnect the condenser immediately afterwards with the galvano-meter, and observe the throw. Perform the same exj)erimentwith the other condenser, and vary the resistance between theterminals of the condenser, so as to find by trial the value it musthave in order that the throws may be the same in the two calling the two resistance values It and K, and the twocapacities C and C, the capacities are inversely proportional tothe value of the resistances. 298 RADIOTELEGRAPHY The method is more conveniently carried out by arranging twocapacities Ci, C2 and two resistances, Ri, E2, as in Fig. 3, with thebattery and the galvanometer in opposite diagonals. A key isplaced in the battery circuit, and the resistances, Ri, E2, arealtered until, on raising and lowering the key, the galvanometergives no deflection. Under these circumstances, the capacities areinversely as the resistances, or Ci _ E2C2 El. Fig. 3. This method is known as De Sautys method for the comparisonof condensers. One source of difficulty in connection with it is found in theunequal absorptions of the dielectrics of the two condensers, if these are made of different a condenser is charged fora certain time and then discharged,a certain proportion of the chargecomes out instantly; the re-mainder comes out more slowly,and is called the residual charge,or the absorbed charge. Differentdielectrics exhibit this effect indifferent degrees; hence, if one ofthe condensers has a dielectric,say, of paraffin paper, and the otherof glass or mica, it is sometimesdifficult to find any ratio of theresistances which entirely abolishes all movement of the galvano-meter needle when the battery key is raised or lowered. For a further discussion of these difficulties the reader may bereferred to the authors Handbook of the Electri
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
