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

Εξώφυλλο
H.C. Carey & I. Lea, 1826 - 144 σελίδες
 

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Δημοφιλή αποσπάσματα

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 140 - AP b 1, c 2, &c., so that the lower side b 1 of the first flap wraps over the hinge or higher side of the second flap, and so on. When the wind, therefore, acts upon -the sail AI, each flap will press upon the hinge of the one immediately below it, and the whole surface of the sail will be exposed to its .action. But when the sail AI returns against the wind, the flaps will revolve round upon their hinges, and present only...
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 180 - First, I use two vessels in which the steam is to act, and which in other steam engines are called cylinders. Secondly, I employ the steam after it has acted in the first vessel to operate a second time in the other, by permitting it to expand itself...
Σελίδα 228 - The buckets have a lateral orifice, to receive and to discharge the water. The axis of this wheel is embraced by four small beams, crossing each other at right angles, tapering at the extremities, and forming eight little arms.
Σελίδα 232 - Q be opened, the water and air rush out together with prodigious violence, and the drops of water are changed into hail or lumps of ice. It is a sight usually shown to strangers, who are desired to hold their hats to receive the blasts of air: the ice comes out with such violence as frequently to pierce the hat like a pistol bullet.
Σελίδα 7 - Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Σελίδα 182 - A. It must therefore expand, and Its elasticity must diminish, and will no longer balance the pressure of the steam coming from the boiler, and pressing above the piston of B. This piston, therefore, if not withheld by the beam would descend till it came in equilibrio, from having steam of equal density above and below it. But it cannot descend so fast, for the cylinder A is larger than B, and the arch of the beam...

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