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Άλλες εκδόσεις - Προβολή όλων
The Operative Mechanic, and British Machinist: Being a Practical ..., Τόμος 2
Προβολή αποσπασμάτων - 1825
angles applied axis axle bottom brass bricks bucket called centre circle circumference clay cock colour common construction copal cupel cylinder described diameter distance draw edge effect ellipsis engine epicycloid equal fastened feet fixed flax force four frame friction frustum geer groove gudgeon heat hemp hole horizontal hour inches iron joint length lever linseed oil litharge lower machine machinery manner matrass means metal mill mill-stone mortise and tenon motion mould moving nitrous acid operation pallet pass pendulum perpendicular piece pinion pipe piston placed plane plate pounds pressure proportion pulley pump quantity rail raised ratchet-wheel represented rollers rope round sandarac screw shaft side sliding spindle square steam steel stone sufficient surface teeth thickness threads tooth tube turned turpentine upper valve varnish velocity vertical vessel water-wheel weight wheel whole wire wood yarn
Σελίδα 690 - Multiply the sum of the two parallel sides by the perpendicular distance between them, and half the product will be the area.
Σελίδα 721 - 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...
Σελίδα 691 - 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.
Σελίδα 59 - 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.
Σελίδα 721 - ... 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.
Σελίδα 58 - 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. *
Σελίδα 489 - ... 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.
Σελίδα 115 - ... 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.
Σελίδα 731 - 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...