Machine Design ... (Google eBook)

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American school of correspondence at Armour institute of technology, 1905 - Machine design
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Page 25 - The CYCLOID is the curve described by a point on the circumference of a circle rolling in a straight line.
Page 23 - The radius of the pitch circle of a circular wheel is called the geometrical radius; that of a circle touching the crests of the teeth is called the real radius; and the difference between those radii, the addendum. 143. Pitch and Number of Teeth. The distance, measured along the pitch line, from the face of one tooth to the face of the next, is called the PITCH. The pitch, and the number of teeth in circular wheels, are regulated by the following principles : I. In wheels which rotate continuously...
Page 47 - A 6-inch belt should hare seven holes, four in the row nearest the end, and a 10-inch belt, nine holes. For any style of lacing care should always be taken that the lacing on the side of the belt next the pulleys is parallel with the edge of the belt. Joints of heavy belts which transmit large...
Page 26 - ... recorder, depending upon the required recording speed. With this experimental setup the transient behavior of the surface conductance has been studied. The transient can best be observed if the Fermi level at equilibrium is in close proximity to the surface state under investigation. As a general rule, it has been found from experience that it is most convenient to have the Fermi level above the surface state if the state is above midgap, and below the surface state for a state below midgap....
Page 50 - The belt can travel in either direction. When a crossed belt connects two pulleys, as in Fig. 48, it is necessary to give a half twist to the two straight parts of the belt in order that they may pass each other and also to bring the same side of the belt in contact with each pulley.
Page 50 - ... increasing the arc of contact. Fig. 46 and Fig. 47 show other methods of connecting shafts which are at right angles, two guide pulleys being used in each case. The same side of the belt comes in contact with each pulley, except at D (Fig. 47) where it is not possible on account of the crossed belt.
Page 26 - ... side of the inscribed equilateral triangle is to the radius of the circle as the square root of 3 is to 1 (Prop. V. Cor. 3, Bk. VI.) ; consequently, the side is to the diameter, or twice the radius, as half the square root of 3 is to 1, and half the square root of 3 is 0.8660, approximately. Also, since the ratio of the circumference of a circle to its diameter is as 3.1416 to 1, the side of the inscribed equilateral triangle, when the circumference is 1, equals 0.8660 -4- 3.1416, or 0.2757.
Page 25 - If a circle rolls on a straight line the curve traced by a point on the circumference is called a cycloid.
Page 61 - It has a polygonal prism, mn o, etc., for its pitch surface, and as the links are of the same length, the pitch line is a regular polygon, each side Iteing equal to the distance from center to center of the rivets.

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