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Page 326 - The results are given in the following table : — It will be seen that the...
Page 7 - DanielPs elements at first increased, then attained a maximum, and with further increase of charge actually diminished. On turning the replenisher in the inverse direction the sensibility at first increased, attained the maximum previously observed, and only on further reduction of charge diminished. Before giving the experimental results, it may be worth while to briefly examine the theory of the quadrant-electrometer. Let A, B, C, D be the potentials of the quadrants, the needle, and the inductor...
Page 130 - ... we shall have, in passing from the outside to the centre, a series of strata in a more and more perfect crystalline condition. Light, as we know in the case of some bodies, tends to promote crystallization, and, when it falls on the surface of such a stick of selenium, probably tends to promote crystallization in the exterior layers, and therefore to produce a flow of energy from within outwards, which under certain circumstances appears, in the case of selenium, to produce an electric current....
Page 19 - When 0=1439 and y=-676, it was found that 0= +676 ; the calculated value is 688. A further experiment of verification, involving only the capacity of the quadrant, is the following. The quadrant A being connected to the case, B was charged by contact instantaneously made and broken with a battery of known potential, and the resulting deflection was noted. The instantaneous contact being made by hand, no very great accuracy could be expected. Let...
Page 16 - As a convenient temporary unit of capacity the value of /8/t2, when the jar has the standard charge, is taken. The first set of experiments was to determine the deflections caused by known potentials with varied charge of jar, one or other of the quadrants being insulated. Three potentials of the jar were used — that of the standard indicated by the idiostatic gauge and two lower. The values of /* are denoted by /j,3, /*2, p-^.
Page 145 - IN one of a series of well-known papers (Pogg. Annal. vol. cxxxix. part 1 ; and Phil. Mag. April 1871; Prof. Quincke has recorded a large number of measures of flat drops and bubbles, from which he has deduced the value of the tensions, not only at the free surface of liquids, but also at the common surface of two liquids in contact. The numerical results obtained exceed very appreciably the values of the surface-tensions deduced from observations with capillary tubes, and Prof. Quincke attributes...
Page 107 - As 0 passes through the next quadrant the surface is a nodoid, the limits being the sphere, and a circle the plane of which is perpendicular to the axis of revolution, which is, as Plateau points out, a purely mathematical limit. In the third quadrant the surface is again a nodoid, the limits of which are the circle and catenoid. Finally, when 6 lies between 37T/2 and 2?r the surface is an unduloid, the limits of which are the catenoid and the cylinder.
Page 18 - The next experiment was similar, excepting only that the insulated quadrant B was connected to a condenser ; this condenser consisted merely of a brass tube insulated within a larger tube — its capacity is about 0'00009 microfarad. The jar was at its standard charge. Calling the capacity of the condenser b, in terms of our temporary unit, we have, as before, . , When 0=1259, <f> was observed to be 927, whence 6 = 3-159.
Page 227 - It is a common practice of thermometer-makers to examine the bore of a tube before it is made into a thermometer by passing a thread of mercury along it, and often, indeed, the stems are divided and fully calibrated before the bulb is attached and the tube closed. From what has been ascertained as to the effect of the air on the interior of the tube, it is obvious that a tube which has been treated in such a manner will be utterly useless for any really delicate instrument.