Hours with the ghosts, or, Nineteenth century witchcraft : illustrated investigations into the phenomena of spiritualism and theosophy (1897)
Evans, Henry Ridgely, 1861-1949, Harry Houdini Collection (Library of Congress) DLC · Chicago : Laird & Lee · leaf 124
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… … 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,…
Blavatsky, H. P. (Helena Petrovna), 1831-1891 · Spiritualism · Theosophy
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