Appletons' Annual Cyclopædia And Register of Important Events of the Year ..

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Reuleaux has formed a collection of seme thousand models for the illustration of the j rinciples of mechanics. His apparatus shows how, accord- ing to the theorem of Poinsot, the relative motion of two bodies may be exemplified by the rolling of two curves upon each other: their point of contact is the momentary centre of the motion, and all the points of each carve are the momentary centres of the motion of corresponding points in the other curve. A number of experimental models, designed ly P...rof. Reuleaux. demonstrate how advantage- ously fluids, when inclosed in proper vessels, 516 MECHANICAL IMPROVEMENTS AND INVENTIONS.
might be employed in mechanics. He shows that a column of fluid, with valves, is perfectly analogous to a ratchet-gear.
Among the many methods devised of late for propelling street-cars by other power than that of horses, the invention of M. MSkarski, which was put into practical use this last year in Paris, deserves special notice. The motive power is compressed air, which must be sup- plied from reservoirs at the end of the line, filled by expansive condensing engines, which work compressing pumps with a power of compressing air to a pressure of 25 or 30 atmospheres.


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