A treatise on gyrostatics and rotational motion . g. 21. Gyrostatic spring balance. In this connection we may refer toanother arrangement suggested by Lord Kelvin—a gyrostatic imitationof a spiral spring—in which a constant dis-placement is produced and maintained by theaction of a constant force in a fixed direction,involving the application of a couple of constantmoment, though not of constant direction ofaxis. This gyrostatic. spring balance is indicatedin a paper entitled On a Gyrostatic AdynamicConstitution for Ether, published partly in theComptes rendus,* and partly in the Proceedingsof
A treatise on gyrostatics and rotational motion . g. 21. Gyrostatic spring balance. In this connection we may refer toanother arrangement suggested by Lord Kelvin—a gyrostatic imitationof a spiral spring—in which a constant dis-placement is produced and maintained by theaction of a constant force in a fixed direction,involving the application of a couple of constantmoment, though not of constant direction ofaxis. This gyrostatic. spring balance is indicatedin a paper entitled On a Gyrostatic AdynamicConstitution for Ether, published partly in theComptes rendus,* and partly in the Proceedingsof tlw Jioijal Soclrfif of Edinburgh.^ It isdescribed in some detail in his Popular Lecturesand The arrangement of gyrostatsis shown in the diagram, and is fairly simple inconception. It does not however, except under certain conditions not easily realisable even approximately, possess thepeculiar property of a spiral spring of being drawn out a distance propor-tional to the weight hung on the lower hook. The gyrostatic arrangement. ? Comjihs rnuln-i, vol. 109, p. !>.>, 1889; Moth, and Phys. Papers, vol. .>, p. 466. \ Proceedings of thi Royal Society ojEdinburgh, vol. II, J Vol. L, p. 237, et seq. i INTRODUCTORY 25 is very difficult bo realise with ordinary gyrostats, but presents qo difficulty with properly constructed motor driven instruments. It consistsoi a frame of four equal bars, constructed by jointing the bars freely toevther at their extremities in the manner shown by the diagram, amihung from a vertical swivelling pin at one corner, so that one diagonal ofthe frame is vertical, and another vertical swivelling pin at the lowestcorner carries a hook. Four equal gyrostats are inserted, one in each baras shown, with its axis along the bar, and are given equal rotations in thedirections shown by the circular arrows. Under the couples tending tochange the directions of the axes of the flywheels, and applied by theweights of the gyrostats and b
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