The Fluid Mechanics ClipArt gallery offers 75 images of the study of liquids and gasses, how they move, and how they react to forces on them. Many additional examples may be found in the Fluid Pumps gallery in the Business and Industry section.

A suction-pump with the upward and downward movement of the piston being effected by means of a lever.

Suction-pump

A suction-pump with the upward and downward movement of the piston being effected by means of a lever.

A suction-pump in which the alternate motion of the piston is effected by means of a rotary motion.

Suction-pump

A suction-pump in which the alternate motion of the piston is effected by means of a rotary motion.

"Two soap bubbles connected by a tube showing the movement which takes place due to the difference in curvature." -Department of Agriculture, 1899

Surface Tension

"Two soap bubbles connected by a tube showing the movement which takes place due to the difference in…

Capillary tubes of various widths.

Capillary Tubes

Capillary tubes of various widths.

"Four-way cock, a cock having two passages in the plug and four passage-ways for delivery, or one which unites four pipes so as to deliver from either one at will, according to the position of the valve. Such a cock is used in the continuous air-brake." -Whitney, 1911

Four-Way Cock Valve

"Four-way cock, a cock having two passages in the plug and four passage-ways for delivery, or one which…

"As the ball of wood is dropped into the container or water, the water level rises and is caused to flow into the bucket. The water in the bucket, once weighed, is equal to the weight of the wooden ball." —Quackenbos 1859

Water Displacement

"As the ball of wood is dropped into the container or water, the water level rises and is caused to…

"Suppose we have a pipe A B laid in a horizontal position so that the centre line is exactly at the same level all along the pope, and differences of level may be neglected. Let water be delivered b this pipe at a steady from a reservoir provided with a constant supply which keeps the free surface level always the same.  If the pipe A B is of uniform sectional area throughout, and is at all points offers a uniform frictional resistance to the flow of the water, the pressure will gradually become less at points along it more and more distanct from the reservoir. This is no lonfer the case when the pipe is larger at one place than another, as shown in the [figure]." (Britannica, 1891)

Water Flow in Pipes

"Suppose we have a pipe A B laid in a horizontal position so that the centre line is exactly at the…

"a, a, a, represents the water-level of a pond or reservoir upon elevated ground. From this pond a line or pipe is laid, passing over a bridge or viaduct at d, and under a river at c. The fountains, at b, b, show the stream rising to its level in the pond, a, at two points of very different elevation." — Wells, 1857

Water Level

"a, a, a, represents the water-level of a pond or reservoir upon elevated ground. From this pond a line…

"No matter what the size or shape of a body of water may be, its surface has the same level throughout." —Quackenbos 1859

Uniform Water Level

"No matter what the size or shape of a body of water may be, its surface has the same level throughout."…

"The pond is tapped with a pipe leading to two fountains and a home. The water provided by the pipe will extend upward in the home and fountains to the same level as the pond." —Quackenbos 1859

Tapped Water Level

"The pond is tapped with a pipe leading to two fountains and a home. The water provided by the pipe…

"Suppose the cistern a to be capable of holding one hundred gallons, and into its bottom there be fitted the tube b, bent, as seen in the figure, and capable of containing one gallon. The top of the cistern, and that of the tube, being open, pour water into the tube at c, and it will rise up through the perpendicular bend into the cistern, and if the process be continued, the cistern will be filled by pouring water into the tube. Now it is plain, that the gallon of water in the tube presses against the hundred gallons in the cistern, with a force equal to the pressure of the hundred gallons, otherwise, that in the tube would be forced upwards higher than that in the cistern, whereas, we find that the surfaces of both stand exactly at the same height." —Comstock, 1850

Water Pressure

"Suppose the cistern a to be capable of holding one hundred gallons, and into its bottom there be fitted…

"Suppose a number of vessels, of different shapes and sizes to have a communication between them, by means of a small tube, passing from the one to the other. If, now, one of these vessels be filled with water, or if water be poured into the tube A, all the other vessels will be filled at the same instant, up to the line B C. Therefore, the pressure of the water A, balances that in 1, 2, 3, while the pressure in each of these vessels is equal to that in the other, and so an equilibrium is produced throughout the whole series." —Comstock, 1850

Water Pressure

"Suppose a number of vessels, of different shapes and sizes to have a communication between them, by…

The instrument called the water-level illustrates the principle of equilibrium in vessels communicating with each other.

Water-level

The instrument called the water-level illustrates the principle of equilibrium in vessels communicating…

"Enlarged sectional view of a ripple or train of waves." —Croft 1917

Wave

"Enlarged sectional view of a ripple or train of waves." —Croft 1917

Weighing a substance in water.

Weight

Weighing a substance in water.