. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 909. THE CAM-PYLO GRAPH. A machine for tracingcomplex geometricalcurves. The smallcrank on the bottomplatform rotates theplate containing a mul-^ tiple series of gears,which mesh with pin-ions on fom- radialarms and transfer theirmotion through foursmall but similar g
. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 909. THE CAM-PYLO GRAPH. A machine for tracingcomplex geometricalcurves. The smallcrank on the bottomplatform rotates theplate containing a mul-^ tiple series of gears,which mesh with pin-ions on fom- radialarms and transfer theirmotion through foursmall but similar gear plates to verticalspindles and to reversing gears on theupper platform. The face of the gears on the upperplatform have trammel pivots to carrythe slotted bars that hold the tracingpencil. The tracing table also turns inunison with the gear plate below. Thenumber of loops in the figures are gov-erned by the particular ring gear used. 910. A combination of curves muchused in bank-note engraving. 911. Another form of rosette Figures formed by a single line tracing. 913. Figure formed by four separateline tracings. 360 DRAUGHTING DEVICES. 913A. A MACHINE FORPRODUCING COMPLEXDESIGNS. A machine bythe aid of which any numberof intricate pen designs maybe produced is shown inthe accompanying illustra-tion. It is called a geomet-ric chuck, and consists of aseries of rows or planes ofwheels, arranged in wheel, cog and screwis so true in workmanshipand arrangement that thereis no noticeable friction when the machine is in motion. SECTION XXIII. PERPETUAL MOTION. 361 Section MOTION. INTRODUCTION. The history of the search for perpetual motion does not afford a singleinstance of ascertained success ; all that wears any appearance of proba-biHty remains secret, and like other secrets, can not be defended in anysatisfactory way against the opinions of the skeptical, who have in theirfavor, in this instance, an appeal to learned authorities against th
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