The elements of mechanism |
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Common terms and phrases
A B and C D action arrangement attached axes axis balance wheel band bell crank bevil wheels bobbin carried centre of motion circular motion cone connecting rod construction contrivance crank curve cutter cylinder dead wheel describing circle detent diagram diameter disc draw drive the wheel driving band ellipse engine epicycloid equal escape wheel fixed friction groove hypocycloid inch lathe lever machinery mechanism move movement number of teeth obtain opposite directions oscillation pallet parallel motion pendulum perpendicular piece pinion piston pitch circles planing machines plate portion position pulley rack ratchet wheel represent reversing revolution revolves roller rolling rope rotation screw shaft shown in Fig sliding space spindle spring spur wheels steam straight line strap Suppose surface swing thread tion tooth train of wheels turn vertical vibrating
Popular passages
Page 195 - 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...
Page 185 - Two curves are said to be similar, when there can be drawn in them two distances from two points similarly situated, such, that if any two other distances be drawn equally inclined to the former, the four are proportional.
Page 258 - The angle at the centre of a circle is double the angle at the circumference on the same arc.
Page 39 - It is easy to understand, that as the cam rotates in the direction of the arrow, the roller p at the end of the lever A p will be raised gradually 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...