. The domestic word : a practical guide in domestic and social economy. d on the slide, there is an additionalglass or disc on which is painted, say, I the world, which you require to is readily done by turning a smallhandle connected with the moveable ob-ject by a toothed rack. The sails of awindmill, the paddle-wheel of a steamer,and other objects, may be thus made torevolve by this appliance, which is calledthe rack and pinion. Slipping Slides.—These are also doubleslides without the rack and pinion. Onone glass is a painted figure in a certainposition, and on the other an adju
. The domestic word : a practical guide in domestic and social economy. d on the slide, there is an additionalglass or disc on which is painted, say, I the world, which you require to is readily done by turning a smallhandle connected with the moveable ob-ject by a toothed rack. The sails of awindmill, the paddle-wheel of a steamer,and other objects, may be thus made torevolve by this appliance, which is calledthe rack and pinion. Slipping Slides.—These are also doubleslides without the rack and pinion. Onone glass is a painted figure in a certainposition, and on the other an adjustingfigure or portion of a figure, so that byslipping the moveable glass backwardsand forwards, the position is suddenlyaltered; for instance, a man may bestanding on horseback on the fixed glass,and on the other he is standing upon hishead. The sudden effects of these slip-ping slides are exceedingly comical andamusing. The Chromatrope.—The Chromatropewas first suggested by W. Allen, Esq.,, in his chemical lectures, someyears back, in which he exhibited a. kaleidoscope, illuminated by the oxygenlight. It was then known in an ele-mentary form for some time under thename of Chinese fireworks, and at theAdelaide Gallery as the Pyreidotropethis consisted of two discs of tin metaperforated with different designs; theseopenings on one disc being covered withcoloured silk, and the two discs revolvingin opposite directions, produced a similar i86 b MomtBtk Montr: effect to the chromatrope, but were notadapted for the lantern. But the chro-matrope in its present brilliant andperfected arrangement is due to , the well-known artist of thePolytechnic Institution. The chroma-trope is represented above. It consists oftwo circular discs of glass painted in re-verse directions, with geometrical figuresin brilliant colours. When one of thesediscs is moved, by means of rack-work,over the other, a great variety of figuresis produced, which resemble those of thekaleidoscope, bu
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