Piston and Rod

"A piston and rod shown with attached weight. The valve, A, can be opened and closed as needed so that…

Balance

A balance used for measuring weight.

Balance

"When bodies of equal weight are supported by the arms of a lever, they will balance each other when…

Balance

In the common balance there is a stiff piece of metal called the beam, which turns about the sharp edge…

Balance for Purposes of Accuracy

A balance of great delicacy with the glass case that contains it.

Balance Scale

An illustration of a balance scale.

Antique Roman balance from Pompeii

This antique Roman balance from Pompeii has one pan that hangs from a rod.

Danish Balance

A weighing apparatus somewhat resembling the steelyard, but differing from it by having the fulcrum…

Spiral Balance

"A form of balance in which the weight of the body under examination is measured by the stretching (torsion)…

Block and tackle

"Combinations of pulleys are made in great variety. In the forms most commonly used, one continuous…

Plumb Bob

A conoid shaped metal bob or weight attached to the end of a plumb line.

Plumb Bob

A conoid shaped metal bob or weight attached to the end of a plumb line.

Plumb Bob

A conoid shaped metal bob or weight attached to the end of a plumb line.

Plumb Bob

A conoid shaped metal bob or weight attached to the end of a plumb line.

Vertical Cross Section of Spherical Zones of a Casting

An illustration of a vertical cross section of the spherical zones of a casting with a diameter of 16…

Center of Gravity

"Why does a person carrying a weight upon his back stoop forward? In order to bring the center of gravity…

Center of Gravity

"Why does a person carrying a weight upon his back stoop forward? In order to bring the center of gravity…

Center of Gravity of Standing Blocks

"Where five blocks are placed in this position, the point of gravity is near the centre of the thrd…

Composition by Weight

This illustration shows an arrangement by which the proportion by weight of hydrogen and oxygen in water…

Compound Lever

"In compound levers, equilibrium is established when the power, multiplied by the first arms of all…

Compound Pulley

"Compound pulleys using one fixed and two moveable pulleys to pull a weight up by applying a downward…

Compound Pulley

"Compound pulley designed to use very little power to lift heavy weights." -Avery 1895

Crowbar

"... shows one of the commonest (sic) forms in which this kind of lever appears,-the crowbar. The power…

Jesus Carrying the Cross on the Way to Calvary

"They took Jesus therefore: and he went out, bearing the cross for himself, unto the place called The…

Deflection of Wood Using Known Weights

"Place a known weight (say 100 g.) in the scale-pan, and to this weight add the weight of the clevis…

First Class Lever

"A Lever of the First Kind is one in which the fulcrum is between the power and the weight... where…

First Orders of Lever

In the first order of levers, the fulcrum is between the power and the weight.

Fixed Pulley

"A fixed pulley is one whose block is not movable. In this case, if the weight W be lifted by pulling…

Fixed Pulley

"[This illustration] represents a fixed pulley. The block is attached to a projecting beam. P is the…

Hand holding weight

A hand holding a pointed weight suspended from a string.

Inclined Plane

"Suppose the inclined plane, to be two feet from A to B, and one foot from C to B, then, as we have…

Inlined Plane with Weight

"The power required to force a given weight up an inclined plane, is in proportion to its height, and…

Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

Lever Balanced on fulcrum With Weights

An illustration of a lever with weights m and n with distances a and b from fulcrum. Illustration could…

First Class Lever

"The lever of the first class has the fulcrum between the power and the weight." Examples: a common…

First Class of Lever: Fulcrum Between Power and Weight

This illustration shows the first class of lever. This class employs a fulcrum between the power and…

Second Class Lever

"The lever of the second class has the weight between the power and the fulcrum." Examples: a nutcracker,…

Second Kind of Lever

"In the second order of levers, the resistance is between the fulcrum and the power; and, as before,…

Steel-yard Used as a Lever

Illustration of an ordinary steel-yard being used as a lever. F represents the fulcrum. Weight P is…

Third Class Lever

"The lever of the third class has the power between the weight and the fulcrum." Examples: sewing machine…

Weight Lifter

An old fashioned weight lifter. A is a plug s the air stays compressed. B is the rod portion of a piston.

Hydraulic Machine Exerting Pressure

Illustration of a hydraulic machine. "A principle known as Pascal's Law states that pressure exerted…

Water Pressure Experiment

"Get a lamp-chimney, preferably cylindrical. With a diamond or a steel glass-cutter, cut a disk of window…

Water Pressure Independent of Vessel

"By measuring the weight required to move the end cap of any of the shown tubes filled with water, it…

Experimental Verification of Principle of Archimedes

An experimental verification of the Principle of Archimedes.

Pulley

"A pulley is a grooved wheel, around which a rope is passed, and is either fixed or moveable." —…

Pulley

"The pulley is a lever with equal arms of the first or second class, but, when it moves. the attachments…

Compound Pulley

"Many wheels may be combined together, and in many ways, to form compound pulleys. Whenever there is…

Pulleys

"Pulleys designed to allow the weight to be pulled up while the power is applied downwards." -Avery…

Using a Screw to Raise Weight

"A screw is a cylinder with a helical proection winding around its circumference. This helix is called…

Scale

An instrument used to determine the weight of an object.

Weighing Scale

This is a hydraulic weighing scale were the object is placed on a base and later water is filled into…

Scales

Scales found at Pompeii

Children Using Scales

Five students are learning how to use scales to measure a book. They have balanced the book with some…

Diagram of a Screw

A diagram illlustrating the principal of the screw.

Second Class Lever

"A Lever of the Second Kind is one in which the weight is between the power and the fulcrum." —Quackenbos…

Second Order of Lever

In the second order of levers, the weight is between the power and the fulcrum.