. Modern magic. : A practical treatise on the art of yesg g. Assoon as the upward pressureis removed, the spring h, aspiral coil of fine brass wire,draws back the levers e e,and with them the eyes, totheir original position. Toproduce a continuous roll-ing, the pressure of thepiston is applied and re-laxed alternately, the effectto the spectator being as ifthe figure looked first to theleft and then to the right,although as already ex-plained, the active move-ment of the levers is in theone direction only, thenormal position of the eyesbeing in the other 289 shows th
. Modern magic. : A practical treatise on the art of yesg g. Assoon as the upward pressureis removed, the spring h, aspiral coil of fine brass wire,draws back the levers e e,and with them the eyes, totheir original position. Toproduce a continuous roll-ing, the pressure of thepiston is applied and re-laxed alternately, the effectto the spectator being as ifthe figure looked first to theleft and then to the right,although as already ex-plained, the active move-ment of the levers is in theone direction only, thenormal position of the eyesbeing in the other 289 shows the actionFig. 288. of the second or middle group of levers, servingto produce the opening of the mouth. The chin of the figureconsists of a solid block of wood i, working on a pivot j in eachcheek, and so counterweighted that its normal position is as in , thus keeping the mouth closed. When, however, the shaft k israised by pressure from below, the lever / rises with it, and propor-tionately depresses the opposite end of the block i, thereby opening the.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondon, bookyear188
