The Operative Mechanic, and British Machinist: Being a Practical Display of the Manufactories and Mechanical Arts of the United Kingdom, Volume 1

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Knight and Lacey, 1825 - Machinery - 795 pages
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Page 684 - Multiply the sum of the two parallel sides by the perpendicular distance between them, and half the product will be the area.
Page 687 - Or, from 8 times the chord of half the arc, subtract the chord of the whole arc, and $ of the remainder will be the length of the arc, nearly.
Page 715 - Letters written on vellum or paper are gilded in three ways : in the first, a little size is mixed with the ink, and the letters are written as usual ; when they are dry a slight degree of stickiness is produced by breathing on them, upon which the gold leaf is immediately applied, and by a little pressure may be made to adhere with sufficient firmness. In the second method, some...
Page 685 - NOTE. — 1. As 7 is to 22, so is the diameter to the circumference; or, as 22 is to 7, so is the circumference to the diameter.
Page 55 - He broke a rope of two inches in circumference ; though, from his awkward manner, he was obliged to exert four times more strength than was necessary. He lifted a rolling stone of eight hundred pounds' weight with his hands only, standing in a frame above it, and taking hold of a chain fastened thereto.
Page 715 - ... hair pencil ; when quite dry, the glass is put into a stove heated to about the temperature of an annealing oven ; the gum burns off, and the borax, by vitrifying, cements the gold with great firmness to the glass ; after which it may be burnwhed.
Page 54 - By the strength of his fingers, (only rubbed in coal ashes to prevent them from slipping,) he rolled up a very strong and large pewter dish. " 2. He broke seven or eight short and strong pieces of tobacco-pipe with the force of his middle finger, having laid them on the first and third finger. *
Page 485 - ... minute hands. The wheel E performs one revolution in an hour ; the wheel NN, which is turned by the axis of the wheel E, must likewise make only one revolution in the same time ; and the minute-hand is fixed to the socket of this wheel.
Page 111 - ... 4. Divide the circumference of the wheel in feet by the velocity of its floats in feet per second, and the quotient will be the number of seconds in which the wheel turns round.
Page 723 - One is seated on the floor, with a large flat stone before him, and with a moveable flat stone-stand at his side. His fellow-workman stands beside him with a crucible filled with melted lead, and having poured a certain quantity upon the stone, the other lifts the moveable stone, and dashing it on the fluid lead, presses it out into a flat and thin plate, which he instantly removes from the stone. A second quantity of lead is poured in a similar manner, and a similar plate formed ; the process being...

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