An illustration of a balance scale.

Balance Scale

An illustration of a balance scale.

Student learning to measure weights.

Measuring

Student learning to measure weights.

This is a hydraulic weighing scale were the object is placed on a base and later water is filled into the vessel to accurately measure the objects weight.

Weighing Scale

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

Scales used for coining.

Scales

Scales used for coining.

An illustration of a price computing spring weighing machine.

Spring Weighing Machine

An illustration of a price computing spring weighing machine.

"Take a piece of ivory, or any other substance that will sink in water, and weigh it accurately in the usual manner; then suspend it by a thread, or hair, in the empty cup a, and balance it. Now pour water into the cup, and it will be found that the suspended body will lose a part of its weight, so that a certain number of grains must be taken from the opposite scale, in order to make the scales balance as before the water was poured in. The number of grains taken from the opposite scale, show the weight of a quantity of water equal to the bulk of the body so suspended." —Comstock, 1850

Water Weighing

"Take a piece of ivory, or any other substance that will sink in water, and weigh it accurately in the…

An illustration of a price computing weighing machine.

Price Computing Weighing Machine

An illustration of a price computing weighing machine.

An illustration of a price computing weighing machine using an even even balance and pendulum.

Price Computing Weighing Machine

An illustration of a price computing weighing machine using an even even balance and pendulum.