The Elements of Mechanism

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Longmans, Green, and Company, 1871 - 269 páginas
 

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Página 258 - The angle at the centre of a circle is double the angle at the circumference on the same arc.
Página 193 - The indicator-piston is pressed from below by the steam, and from above by the atmosphere. When the pressure of the steam is equal to that of the atmosphere, the spring retains its unstrained length, and the piston its original position. When the pressure of the steam exceeds that of the atmosphere, the piston is driven outwards, and the spring compressed ; when the pressure of the steam is less than that of the atmosphere, the piston is driven inwards...
Página 39 - Fig. 34. by the curved portion ab, will be held at rest while bc passes underneath it, and, finally, will be allowed to fall by the action of c a. In this way a cam may be made to impart any required motion, and may...
Página 149 - The insertion of a tooth in this manner prevents contact between the same pair of teeth too often, and insures greater regularity in the wear of the wheels. The tooth inserted was called a hunting cog, because a pair of teeth, after being once in contact, would gradually separate and then approach by one tooth in each turn, and thus appear to hunt each other as they went round.

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