## A Treatise on Belts and Pulleys |

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arbor axes belt inch thick belt-width belts and pulleys BELTS OVER CAST-IRON BELTS OVER LEATHER-COVERED calculated CAST-IRON PULLEYS circular measure circumferential velocity coefficient of friction covered pulleys crossed belt deflection diameter Double leather-lacing double rawhide-lacing driven pulley driving-pulley equal Example fastened feet per second figure FORMULAS FOR LEATHER fractions of circumference gives grooves Hence horse-power L₁ lacing leather-covered pulleys lever-arm bc loose pulleys means metallic cable middle planes number of revolutions obtain open belt pounds per square principal pulleys pulley in feet pulley-guides pulley-supports pulleys of transmission radii radius rawhide represented in Fig revolutions per minute riveted joint rope-belts rotary motion rotation S₁ shown in Fig Single leather-lacing single rawhide-lacing smaller pulley speed-cones square inch TABLE OF FORMULAS TABLE OF WIDTHS tangent tension tion transmission by cable transmits a force velocity in feet VULCANIZED-RUBBER BELTS wires wrought-iron ΙΟ

### Popular passages

Page 191 - ... inches diameter for secondary drives. The diameter of the smallest pulley should not be less than thirty times the diameter of the rope, as the larger the pulley the less will be the internal friction, and consequent injury to the rope from bending and unbending (see the following table).

Page 16 - To find the piston speed of an engine, multiply the stroke in inches by the number of revolutions per minute and divide the product by 6. EXAMPLE. — An engine with a 52-inch stroke runs at a speed of 66 revolutions per minute.

Page 23 - horse-power," as commonly used, is equivalent to 33,000 foot-pounds : it is that amount of force or power which will lift a weight of 33,000 pounds one foot high in one minute, or a weight of one pound 33,000 feet high in one minute.

Page 15 - The velocity is found by multiplying the circumference of the pulley in feet by the number of revolutions per minute.

Page 134 - Problem. Two balls A and B are connected by a rod which is made to revolve upon a centre, the weight of A is 3 Ibs., and that of B is 4 Ibs., the distance of A from the axis is 8 ft., and that of B is 5 ft. ; if a point in the rod, at 1 foot from the axis, has a velocity of 10 feet per second; it is required to determine the work in the balls, and the point in the rod where we may suppose the weight of the two halls collected, so that the work may not be altered.

Page 15 - Ibs. per square inch) by twice the length of stroke (in feet) and by the number of revolutions per minute, and divide the product by 33000 for the horse-power.

Page 2 - With all their magnificence and vast designs, they are returned into nothing with regard to us. They are dispersed like vapors, and have vanished like phantoms. But the INVENTORS of the ARTS and SCIENCES labored for ALL AGES. We still enjoy the fruits of their application and industry — they have...

Page 1 - Athenian ship yard — would have been more truly useful and more reolly interesting than all that ancient philosophers ever wrote or poets ever sung. A description of the foundries and forges of India and of Egypt, of Babylon and Byzantium, of Sidon and Carthage and Tyre, would have imparted to us a more accurate...