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Actor in Elizabethian costume.

Actor

Actor in Elizabethian costume.

(1844-1923) Parisian actress who appeared in performances throughout USA, London and Europe.

Sarah Bernhardt

(1844-1923) Parisian actress who appeared in performances throughout USA, London and Europe.

"The first alteration to be noticed in the double-acting engine is that of the cylinder. To insure its double action, it is necessary to provide, at each end of the cylinder, a means of admission of steam from the boiler, and of escape for the steam to the condenser. Hence the double action, which means that the piston is both raised and depressed by the force of steam. For this purpose, a steam box is fixed to each end of the cylinder, communicating, in the one case with the upper, in the other with the lower, surface of the piston. B is the upper, and and B' the lower, steam box. Each of these boxes is furnished with two valves." —Comstock, 1850

Double-acting Cylinder

"The first alteration to be noticed in the double-acting engine is that of the cylinder. To insure its…

"The first alteration to be noticed in the double-acting engine is that of the cylinder. To insure its double action, it is necessary to provide, at each end of the cylinder, a means of admission of steam from the boiler, and of escape for the steam to the condenser. Hence the double action, which means that the piston is both raised and depressed by the force of steam. For this purpose, a steam box is fixed to each end of the cylinder, communicating, in the one case with the upper, in the other with the lower, surface of the piston. B is the upper, and and B' the lower, steam box. Each of these boxes is furnished with two valves." —Comstock, 1850

Double-acting Cylinder

"The first alteration to be noticed in the double-acting engine is that of the cylinder. To insure its…

"The softening of leather is helped and rendered thorough by working them for some time in the stocks after they have been well soaked." —The Encyclopedia Britannica, 1910

Double-Acting Stock

"The softening of leather is helped and rendered thorough by working them for some time in the stocks…

"A double-acting pump of the piston pattern is shown [here]. Such a pump has two sets of suction valves and delivery valves, one set for each side of the piston. With the piston moving in the direction of the arrow, the pressure of the atmosphere forces the water up the suction pipe P into the left-hand end of the pump cylinder, the left-hand suction valve opens and the left-hand delivery valve is closed...The water now flows up the delivery pipe P'." —Hallock 1905

Double-acting Force Pump

"A double-acting pump of the piston pattern is shown [here]. Such a pump has two sets of suction valves…