. The London, Edinburgh and Dublin philosophical magazine and journal of science. bo ( 9 ) w ill be »=C2V(i-yxy-+-iMP,h^-fe-7i)« (ii) If the mirror-oscillations are to represent the proposedFouriers series F, the integral 3 for a = l : »«=^2r^j8in(^-^^7i) . (15) must give the same curve as F. Any experimental test of this formula is almost out of the question. VI. Working of the Apparatus. When using the apparatus it is necessary to ascertain ifthe deviation is proportional to the strength of current. Forthis purpose the ground-glass plate was replaced by a glassscale, and simultaneous reading
. The London, Edinburgh and Dublin philosophical magazine and journal of science. bo ( 9 ) w ill be »=C2V(i-yxy-+-iMP,h^-fe-7i)« (ii) If the mirror-oscillations are to represent the proposedFouriers series F, the integral 3 for a = l : »«=^2r^j8in(^-^^7i) . (15) must give the same curve as F. Any experimental test of this formula is almost out of the question. VI. Working of the Apparatus. When using the apparatus it is necessary to ascertain ifthe deviation is proportional to the strength of current. Forthis purpose the ground-glass plate was replaced by a glassscale, and simultaneous readings were made on this scale(from any 0-point) and an ammeter. The following valueswere obtained :— Currents hy means of the uPliaseograpli 977 Strength oJ current. Deviation. 1. 2. 100. 103 amp. 1 77 90 161 2-49 80 1-45 2-71 70 1-28 2-93 60 MO 3-15 50 0-94 3-37 40 0-7(5 3-60 30 0-58 3-83 0 o-oo 4-48 7 is noted when one measuring-wire only was used, 2 whenthe same current passed through both the wires. In thesubjoined graphical diagram the direction of 2 is reversed. Fij. The diagram shows that there is proportionality betweendeviation and strength of current. If the instrument is used for registering characteristics, themethod is obvious : we have merely to shunt part of thecurrent off to one measuring wire, while through the othera current is passed that is proportional to the examined voltageLater on I will give complete coupling-diagrams for this useof the apparatus. Another way is to compare two alternate currents witheach other,/, i. strength of current and voltage in transformers,phase-differences between current and tension by self-induction 978 Mr. M. Siegbahn on the Study of Variable and capacity. Through one wire passes then a current i = i0$hi(ot, (16) and through the other e± e0 sin (©* + =sin2 (f>. (18) In the general case the luminous point, consequen
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