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"Crank M raises and lowers the two pistons C and D. The valves allow only for air to be removed from chamber J with a cutoff valve at K. The mercury filled barometer L measures the pressure in J." —Quackenbos 1859

Double Barrel Air Pump

"Crank M raises and lowers the two pistons C and D. The valves allow only for air to be removed from…

"Measures atmospheric pressure. Pressure from the atmosphere compresses the mercury in the tray forcing the mercury accordingly into the graduated tube." —Quackenbos 1859

Barometer

"Measures atmospheric pressure. Pressure from the atmosphere compresses the mercury in the tray forcing…

Blaise Pascal.

Blaise

Blaise Pascal.

Illustration showing Pascal's Volute curves.

Pascal's Volute Curves

Illustration showing Pascal's Volute curves.

"Pascal's Law finds an important application in the hydraulic press, in the more common forms of which the pressure of a piston operated by a lever is transmitted through a pipe to a piston of larger area." -Avery 1895

Hydraulic Press

"Pascal's Law finds an important application in the hydraulic press, in the more common forms of which…

"Pascal's Law finds an important application in the hydraulic press, in the more common forms of which the pressure of a piston operated by a lever is transmitted through a pipe to a piston of larger area." -Avery 1895

Hydraulic Press, Perspective

"Pascal's Law finds an important application in the hydraulic press, in the more common forms of which…

"Pressure exerted anywhere upon a liquid inclosed in a vessel is transmitted undiminished in all direction, and acts with the same force upon all equal surfaces, and in a direction at right angles to those surfaces." -Avery 1895

Pascal's Law

"Pressure exerted anywhere upon a liquid inclosed in a vessel is transmitted undiminished in all direction,…

"...let the area of the piston a be 1 square inch; of b, 40 square inches. According to Pascal's law, 1 pound placed on a will balance 40 pounds placed on b." —Hallock 1905

Pascal's Law and Water Pressure

"...let the area of the piston a be 1 square inch; of b, 40 square inches. According to Pascal's law,…

"Pascal's law finds an important application in the hydraulic press, in the more common forms of which the pressure of a piston operated by a lever is transmitted though a pipe to a piston of larger area." — Avery, 1895

Hydraulic press

"Pascal's law finds an important application in the hydraulic press, in the more common forms of which…

"Let the are of the piston a be 20 square inches; of b, 7 sq. in.; of c, 1 sq. in.; of d, 6 sq. in.; of e, 8 sq. in; and of f, 4 sq. in. If... a force of five pounds be applied at c, a pressure of five pounds per square inch will be transmitted in all directions, and in order that there shall be no movement, the required pressure must be applied by all the other pistons in proportion." —Hallock 1905

Water Pressure Demonstration

"Let the are of the piston a be 20 square inches; of b, 7 sq. in.; of c, 1 sq. in.; of d, 6 sq. in.;…

"As the mercury rises and lowers in the barometer, the float F turns the index, I. Index I points to the correct reading on the graduated scale S." —Quackenbos 1859

Wheel Barometer

"As the mercury rises and lowers in the barometer, the float F turns the index, I. Index I points to…