. On a Standard Voltaic Battery. liary battery was used in the manner before described. This con-sisted of five large Daniells cells working through a circuit consisting of the dynamo-meter and a rheostat, r (fig. 4); a and b are the two terminals of the dynamometer, andthe poles of the auxiliary battery, C, Z, are connected with them; the similar poles of thestandard elements o, z, and the galvanometer, #, are also connected to the same termi-nals ; and the rheostat r is adjusted so that no current passes through the this case it is evident that the poles a and b are maintaine
. On a Standard Voltaic Battery. liary battery was used in the manner before described. This con-sisted of five large Daniells cells working through a circuit consisting of the dynamo-meter and a rheostat, r (fig. 4); a and b are the two terminals of the dynamometer, andthe poles of the auxiliary battery, C, Z, are connected with them; the similar poles of thestandard elements o, z, and the galvanometer, #, are also connected to the same termi-nals ; and the rheostat r is adjusted so that no current passes through the this case it is evident that the poles a and b are maintained at a difference of potentialprecisely equal to that of the standard elements. In this arrangement not the slightestdifficulty is experienced in maintaining a perfectly steady and uniform current throughthe coils of the dynamometer. The poles of the dynamometer were so arranged thatthey could be connected immediately with a Wheatstone balance in order that itsresistance could be measured promptly after each observation. Pig. The winding of the large coils of the instrument was superintended by ProfessorClerk Maxwell, who kindly supplied me with the measurements as follows:— millimetres. Mean circumference of first coil 1558*48 Mean circumference of second coil . . . 1559*16 The depth of each coil is 12*90 The breadth of each coil is 15*00 The distance apart of the planes of the coils . 250mdccclxxiv. c 10 ME. LATIMEE CLAEK ON A STANDAED VOLTAIC BATTEEY. Each layer has 15 windings, and there are 15 layers, so that each coil has 225windings. The small coils were wound afresh by myself; the brass channels for the reception ofthe wire were of different sizes, and the same number of turns could not therefore bewound on it. millimetres. Mean circumference of first coil 359*25 Mean circumference of second coil 357*45 Mean depth of the coils .......... 6*67 Mean breadth of the coils 10*52 Mean distance apart 62*41 Number of windings on first coil 311 Number of windings on second
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectproceed, bookyear1874
