Hours with the ghosts, or, Nineteenth century witchcraft : illustrated investigations into the phenomena of spiritualism and theosophy . ock-work horizontally in front of the moving index,and it contains a sheet of plate-glass which has beensmoked over a flame. The projecting steel point im-presses a mark on this smoked surface. If the bal-ance is at rest, and the clock set going, the result is aperfectly straight horizontal line. If the clock isstopped and weights are placed on the end, B, ofthe board, the result is a vertical line, whose lengthdepends on the weight applied. If, whilst the cl
Hours with the ghosts, or, Nineteenth century witchcraft : illustrated investigations into the phenomena of spiritualism and theosophy . ock-work horizontally in front of the moving index,and it contains a sheet of plate-glass which has beensmoked over a flame. The projecting steel point im-presses a mark on this smoked surface. If the bal-ance is at rest, and the clock set going, the result is aperfectly straight horizontal line. If the clock isstopped and weights are placed on the end, B, ofthe board, the result is a vertical line, whose lengthdepends on the weight applied. If, whilst the clockdraws the plate along, the weight of the board (or thetension on the balance) varies, the result is a curved CROOKES EXPERIMENTS. 121 Tine, from which the tension in grains at any momentduring the continuance of the experiments can becalculated. The instrument was capable of registering a di-minution of the force of gravitation as well as an in-crease; registrations of such a diminution were fre-quently obtained. To avoid complication, however,I will here refer only to results in which an increase ofgravitation was FIG. II. CROOKES APPARATUS. The end, B, of the board being supported by thespring balance, the end, A, is supported on a wooden 122 PHYSICAL PHENOMENA. strip, F, screwed across its lower side and cut to aknife edge (see Fig. 11). This fulcrum rests on a firmandheavy wooden stand, G H. On the board, exactly overthe fulcrum, is placed a large glass vessel filled withwater. I L is a massive iron stand, furnished withan arm and a ring, M N, in which rests a hemispheri-cal copper vessel perforated with several holes at thebottom. The iron stand is 2 inches from the board, A B,and the arm and copper vessel, M N, are so adjustedthat the latter dips into the water 1| inches, being 5^inches from the bottom of I, and 2 inches from its cir-cumference. Shaking or striking the arm, M, or thevessel, N, produces no appreciable mechanical effecton the board, A B, ca
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Keywords: ., bookcentury1800, bookdecade1890, booksub, booksubjectspiritualism
