. The London, Edinburgh and Dublin philosophical magazine and journal of science. roducts (described in Parts I. andII.), information can be deduced concerning the affinity ofthe constituents of the electrolyte, and the variations of thataffinity according as the constituents are nascent or intheir ordinary free state. For instance, the energy given outin the transformation of nascent hydrogen and oxygen intothe ordinary free gases exceeds the energy that would bedeveloped by the union of these gases to form liquid water,i. e. exceeds the energy equivalent to 34100 gramme-degreesor to 1-50 vol
. The London, Edinburgh and Dublin philosophical magazine and journal of science. roducts (described in Parts I. andII.), information can be deduced concerning the affinity ofthe constituents of the electrolyte, and the variations of thataffinity according as the constituents are nascent or intheir ordinary free state. For instance, the energy given outin the transformation of nascent hydrogen and oxygen intothe ordinary free gases exceeds the energy that would bedeveloped by the union of these gases to form liquid water,i. e. exceeds the energy equivalent to 34100 gramme-degreesor to 1-50 volt. [ 370 ] XLIX. On a Method of Comparing the Electrical Capacitiesof two Condensers. By R. T. Glazebrook, , Fellowof Trinity College,and Demonstrator of Experimental Physicsat the Cavendish Laboratory, Cambridge *. THE following is a well-known method of comparing thecapacities of two condensers :—Let A, A/ be the outer coatings, B, B the inner of two con-densers. Connect A A together, and to one pole of abattery. Connect B to a resistance R and to one pole of a B - 1 A. galvanometer, B to another resistance R/ and to the otherpole of the galvanometer. Connect the other ends of R R/together and to a key K, and let the second screw of the keybe in connexion with the other pole of the battery. Let C C/be the capacities of the condensers. On depressing the keythe condensers are charged; and it is easy to show that, ifCR=C/R/, no current passes through the galvanometer. If, then, we adjust R until no current is observed on makingcontact, W remaining unaltered, we can find the ratio of C to C I propose to discuss the more general problem of findingthe current through the galvanometer when the equationCR=C/R/ is not fulfilled, and hence to obtain the conditionsof sensibility. Let Vj be the potential of A, V2 of the other pole of thebattery, V of B, V of B, at time t. Let G be the galvano-meter resistance. Let ,/ h = current in R; current into condenser A; T) , current through
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