The London, Edinburgh and Dublin philosophical magazine and journal of science . (2) Comparison with a standard resistance by direct de-flexion, using an alternating current. The same galvanometerwas used as in (1). The alternating current was obtainedby means of a revolving commutator. This commutatorhad two brass segments on an ebonite drum, and is shown,together with the connexions, in fig. 2. The commutator was the Conductivity of Liquids in Thin Layers. 259 driven by means of a small water-motor. It will be seenfrom the diagram that the current through the galvanometerwas always continuou
The London, Edinburgh and Dublin philosophical magazine and journal of science . (2) Comparison with a standard resistance by direct de-flexion, using an alternating current. The same galvanometerwas used as in (1). The alternating current was obtainedby means of a revolving commutator. This commutatorhad two brass segments on an ebonite drum, and is shown,together with the connexions, in fig. 2. The commutator was the Conductivity of Liquids in Thin Layers. 259 driven by means of a small water-motor. It will be seenfrom the diagram that the current through the galvanometerwas always continuous, but the sensibility was reduced slightlyowing to the insulating spaces between the segments of thecommutator. When the four brushes were set right thedeflexion was quite steady and was not affected by slightchanges in speed, with the liquid layer in circuit. (3) The third method was the modification of the Wheat-stone bridge described by T. 0. Fitzpatrick *. By means ofa double commutator, designed by Prof. Threlfall, an alter-nating current is supplied to two corners of a
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
