Handy man's workshop and laboratory . in a square, and the other orbits are developed by turningthe figure in rhombs, whose minor angles are 75, 60, and 45 de-grees, as indicated. In Fig. 192 the model f is shown ready for operation. Theweighted pencil b is inserted in one of the holes in the card-board and the model is turned around by hand and at the samelime kept in contact with the guides aa, which may be set at any 222 HANDY MAN S WORKSHOP AND LABORATORY angle. As the motion is determined by two contact points, theother two sides are unnecessary. The model used is about sixinches in diame
Handy man's workshop and laboratory . in a square, and the other orbits are developed by turningthe figure in rhombs, whose minor angles are 75, 60, and 45 de-grees, as indicated. In Fig. 192 the model f is shown ready for operation. Theweighted pencil b is inserted in one of the holes in the card-board and the model is turned around by hand and at the samelime kept in contact with the guides aa, which may be set at any 222 HANDY MAN S WORKSHOP AND LABORATORY angle. As the motion is determined by two contact points, theother two sides are unnecessary. The model used is about sixinches in diameter, and from the orbits drawn by the pencil, free-hand ink tracings were made in order to facilitate reproductionin the accompanying cuts. This accounts for some roughness inthe curves, which does not exist in the pencil drawings. Five-sided and seven-sided models (c and d) are shown in the illustra-tion, and also a piece of wood e resting on three-cornered set in motion e travels in a straight line, exactly as if sup-. Fig. 192—Rotagon apparatus for producing geometrical figures ported on cylinders, while the motion of the supports is alternatelycircular and cycloidal. The same motion would follow with anyother form of the rotagon. To most persons it will come as asurprise to realize that a cylinder is not the only form of rollerwhich will impart straight-line motion to a supported body. The rotagon may possess little interest for the mathematicianand may be without value in the realm of mechanics, but its prop-erties are so unique and the infinite variety of its fixed motionsis so startling that it becomes worthy of investigation, even if re-garded only as a scientific toy.—65 HANDY MAN S WORKSHOP AND LABORATORY 223 A HOME-MADE SEISMOGRAPH Trie Scientific American has occasionally told its readers some-thing of the seismograph, and of the mysterious tremors and pul-sations of the earths crust that it reveals. But probably very fewhave ever seen one, or had t
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Keywords: ., book, bookcentury1900, bookdecade1910, booksubjectworkshoprecipes
