. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. TJIANSACTIONS OF SECTION A. 619 the vibration by hand, the weight will hang down at rest, the pin drawn out to a certain degree; and the distance dra\>.. out will be simply proportional to the weifrlit huiiff on, as in an ordinary spring balance. Here, then, out of matter possessing rigidity, but absolutely devoid of elasticity we liave made a perfect model of a sprin
. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. TJIANSACTIONS OF SECTION A. 619 the vibration by hand, the weight will hang down at rest, the pin drawn out to a certain degree; and the distance dra\>.. out will be simply proportional to the weifrlit huiiff on, as in an ordinary spring balance. Here, then, out of matter possessing rigidity, but absolutely devoid of elasticity we liave made a perfect model of a spring in 1;!»' form of a spring balance. Connect millions of millions ot particles by pairs of rouP such as these of this spriii"-balance and we have a group of particles constituting an elastic solid; exactly^fulfillin.' the mathematical ideal worked out by Navier, Poisson, and. Cauchy, and many other inathematicianswho, following their example, have endeavoured to found a theory of the elasticity of solids on mutual attraction and repulsion between a group of material particles. All that can possibly be done by this theory with its assumption of forces acting according to any assumed law of'relation to distance is- done by the gyrostatic system. But the gyrostatic system does, besides, what. the of naturally acting material particles can^iot do: it constitutes an elastic solid which can have the Faraday magneto-opt".c rotation of the plane of polarisation of light; supposing tlie application of our solid to be a model of the luniiniferous ether for_ illu'^trating the undulatory theory of light. The gyrostatic model spring balance is arranged to have zero moment"of momentum as a whole, tic and therefore to_ contribute nothing to the Faraday rotat ion ; witli this arrange ment the model illustrates tiie luniiniferous ether in a field 'uiailecteil by magnetic, force. But now let there Iw a diflerent rotational velocity imparted to the jointed square round
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1885
