. 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. SECTION AND EXAMPLES. 686. Tool post, rose wheel and cutting tool at the work at H, onthe face plate of the lathe. 687. Examples of curved figures made by different forms of rosewheels. 688. PLANETARIUMS. In the lower planetarium the globe rep-resenting the sun is sup
. 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. SECTION AND EXAMPLES. 686. Tool post, rose wheel and cutting tool at the work at H, onthe face plate of the lathe. 687. Examples of curved figures made by different forms of rosewheels. 688. PLANETARIUMS. In the lower planetarium the globe rep-resenting the sun is supported on a central shaft, around which are ar-ranged a series of sleeves,corresponding in numberto the planets of the solarsystem. The shaft sup-porting the sun is causedto rotate in a time rela-tively corresponding tothe diurnal revolution ofthat luminary, and thesleeves which carry thetubes supporting theplanets are also revolvedin times proportionate totheir revolutions aroundthe sun by wheels mesh-ing with gears on a shaftwithin the case A, and provided with an exterior crank by which it isturned. The diurnal revolutions of the planets are caused by bevel-. 26o MOTION AND CONTROLLING DEVICES, ETC. gearing on the sleeves and on rods within the tubular arms abovementioned, which rods also carry on their ends gears for causing therevolution of the satelHtes around their primaries. See Nos. 984 to 992 first volume of mechanical movements for detailsof planetary gear trains. 689. Planetarium of the solar system. 690. THE PHENAKISTOSCOPE. This instrument, which, likethe thaumatrope and zeotrope, depends upon the persistence of visual im-pressions, consists of a circular diskon which a row of figures are paintedin a series of attitudes such as wouldbe consecutively attained in theprogress of an action ; for example,leaping, walking, swimming, effect is to produce the appear-ance of actual motion. The disk isplaced on a handle and rotated by thefinger on a nut. It is held
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