The Philosophical magazine; a journal of theoretical, experimental and applied physics . the fibre and vibrator in a good Sprengelvacuum ; and in conjunction with him I have made somepreliminary experiments, the results of which seem worthquoting. The vibrator used was the lighter of the two referred to inconnection with the former experiments, and consisted of asmall ring of brass 0*295 centimetre radius and 0*012 gi*ammein weight. It was suspended, as shown in the diagram, in-side a small spherical bottle provided with a long neck and aground stopper, to the lower end of which the fibre wasa
The Philosophical magazine; a journal of theoretical, experimental and applied physics . the fibre and vibrator in a good Sprengelvacuum ; and in conjunction with him I have made somepreliminary experiments, the results of which seem worthquoting. The vibrator used was the lighter of the two referred to inconnection with the former experiments, and consisted of asmall ring of brass 0*295 centimetre radius and 0*012 gi*ammein weight. It was suspended, as shown in the diagram, in-side a small spherical bottle provided with a long neck and aground stopper, to the lower end of which the fibre wasattached. A tube passed from the side of the bottle to one * Ou this subject see a paper ^ Ou a New Reflectiug^ Galvanometer ofGreat Seusibility, by T. and A, Gray, Proc. Roy. Soc. No. 230 (1884). Galvanometers J and on the Rigidity of Silk Fibre. 51 end of a U-tiibe, containing phosphoric acid and beads ofglass, the other end of which was sealed to a tube leading tothe Spreno-el pump. The vibrator was attached to the fibreby means of three short single fibres, in the manner shown in. the sketch. The results are given in the following table, themeaning of the numbers in the different columns of whichwill be readily understood from the headings. In the columnheaded numbers of vibrations observed the figures repre-sent roughly the number of periods which could be observedat the different degrees of exhaustion, shown in the precedingcolumn, beginning in each case from an amplitude of about60°, and observing directly the transits of a black spot on thering over a fixed mark until the amplitude fell to about 10°. The results are sufficient to show that the effect of theviscosity of the fibre in damping the vibrations is very smallin comparison with the effect of the air friction; and it seemsprobable that amoderatelyheavyvibrator(sayabout 2grammesin weight) with a small magnetic needle attached, and sus-pended by a single silk fibre, may prove a good arranLi:enientfor experiments s
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