The Philosophical magazine; a journal of theoretical, experimental and applied physics . different columnsbeing sufficiently explanatory of the numbers. Vibrator Method. o . co .3 C=5 x .5 t c o dityits of cen-bre. Eadiusof gy of vibrator centimetre Lengtli of fin centimet Diameter ofin centimet Period of vibin second Torsional rigin una length of 1tini. of the f] 0-0274 0-20 8-(i0 0-0008 29 000096 00114 0-29 8-60 0-0010 IG 0-00132 48 Mr. T. Gray oti Silk v. Wire Suspensions in Magnetic Method. =5 a 3 £ ?£ e3 a Deflection per turnof torsion-head on a scale of milli-metres. Magneticfield
The Philosophical magazine; a journal of theoretical, experimental and applied physics . different columnsbeing sufficiently explanatory of the numbers. Vibrator Method. o . co .3 C=5 x .5 t c o dityits of cen-bre. Eadiusof gy of vibrator centimetre Lengtli of fin centimet Diameter ofin centimet Period of vibin second Torsional rigin una length of 1tini. of the f] 0-0274 0-20 8-(i0 0-0008 29 000096 00114 0-29 8-60 0-0010 IG 0-00132 48 Mr. T. Gray oti Silk v. Wire Suspensions in Magnetic Method. =5 a 3 £ ?£ e3 a Deflection per turnof torsion-head on a scale of milli-metres. Magneticfield = Distance of thescale from themirror, in centi-metres. Torsional rigidity,in C units,of a lengtli of1 centim. Youngs modulus for tlio fibre, weight in grammes*. 9059-208-459-55 000100-00090-001450-0015 80 80 21-0 21-5 117-0117011701170 •00143•00U90?00216•00250 75-4613G56735 The following curve illustrates an experiment, and showshow nearly proportional the first deflection is to the torsion evenafter the elastic limit of the fibre lias been far exceeded. In. the first part of the cui-ve the ordinates are the scale-readings,the abscissaB the angle turned throuo-h bv the torsion-head, * This is the ratio of the product of the pull applied to the fibre, and the length of the fibre, to the elongation produced bv the pull, or, if E be the , , T-i weioht applied x leuyth of fibre modulus, K= ^ ^^ : s— elongation. GatvanometetSj and on the Riyidity of Silk Fibre. 49 which we may, without appreciable error, assume to bethe torsion of the fibre, as the angle turned through by themirror is so small as to be negligible; in the last part theordinates have the same meaning, but the abscissse indicatetime. This second part of the curve shows the rate at whichthe fibre takes a set under the torsional stress ; the part of thiscurve below the zero-line shows the working out of the setafter the fibre was untwisted. The length of the fibre in thisexperiment was 8*5 centim,
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