The bushel, a unit of dry measure.

Bushel

The bushel, a unit of dry measure.

Calipers used to take measurements; using compasses with curved legs, for measuring the diameter, of round bodies.

Calipers

Calipers used to take measurements; using compasses with curved legs, for measuring the diameter, of…

"To find the number of bushels of grain in a bin or box, multiply the length in feet by the height in feet, then by the width in feet and then by 8. For instance. In a bin 10 feet long, 6 feet high and 8 feet wide, 10 x 8 x 6 x 8 = 384." -Foster, 1921

Capacity

"To find the number of bushels of grain in a bin or box, multiply the length in feet by the height in…

Illustration comparing the fundamental units of measure quart and liter.

Comparison Of Units Of Capacity

Illustration comparing the fundamental units of measure quart and liter.

Illustration comparing the fundamental units of measure 1 cubic yard and 1 cubic meter.

Comparison Of Units Of Cubic Measure

Illustration comparing the fundamental units of measure 1 cubic yard and 1 cubic meter.

"Goniometer. An instrument for measuring solid angles, or the inclination of planes, particularly the angles formed by the faces of crystals." -Whitney, 1911

Hand Goniometer

"Goniometer. An instrument for measuring solid angles, or the inclination of planes, particularly the…

"Goniometer. An instrument for measuring solid angles, or the inclination of planes, particularly the angles formed by the faces of crystals." -Whitney, 1911

Reflection Goniometer

"Goniometer. An instrument for measuring solid angles, or the inclination of planes, particularly the…

"Gyroscope. Gyroscopic top, an instrument consisting of a heavy fly-wheel revolving about an axis one point of which is fixed, but which is otherwise free to move in any way." -Whitney, 1911

Gyroscope

"Gyroscope. Gyroscopic top, an instrument consisting of a heavy fly-wheel revolving about an axis one…

"Foucault's Gyroscope. GYROSCOPE. An instrument consisting of a fly-wheel, the axis of which can turn freely in any direction, designed to illustrate the dynamics of rotating bodies." -Whitney, 1911

Foucault's Gyroscope

"Foucault's Gyroscope. GYROSCOPE. An instrument consisting of a fly-wheel, the axis of which can turn…

"Gyrostat. An instrument for illustrating the dynamics of rotation, composed of a box or case having a sharp bearing-edge in the form of a regular polygon, and containing a fly-wheel having its center and its direction of rotation in the plane of the bearing-edge." -Whitney, 1911

Gyrostat

"Gyrostat. An instrument for illustrating the dynamics of rotation, composed of a box or case having…

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the lengths of lines a and b are the same. You would need to measure to be sure of your conclusion.

Optical Illusions

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the…

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the lengths of lines a and b are the same. You would need to measure to be sure of your conclusion.

Optical Illusions

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the…

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the lengths of lines a and b are the same. You would need to measure to be sure of your conclusion.

Optical Illusions

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the…

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the lengths of lines a and b are the same. You would need to measure to be sure of your conclusion.

Optical Illusions

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the…

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the lines are the same distance apart. You may need to measure to be sure of your conclusion.

Optical Illusions

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the…

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the lines are the same distance apart. You may need to measure to be sure of your conclusion.

Optical Illusions

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the…

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the lines are prolongations of the other lines. You may need to measure to be sure of your conclusion.

Optical Illusions

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the…

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the lines are prolongations of the other lines. You may need to measure to be sure of your conclusion.

Optical Illusions

Illustration showing optical illusions. It is not always possible to trust the eye to be sure if the…

Illustration that uses triangles to measure the distance across a lake.

Using Triangles To Measure A Lake

Illustration that uses triangles to measure the distance across a lake.

Illustration that uses triangles to measure the distance across a lake.

Using Triangles To Measure A Lake

Illustration that uses triangles to measure the distance across a lake.

Illustration of 2 children measuring liquids in pints and quarts. It can be used to write mathematics story problems involving measurement.

Children Measuring Liquid

Illustration of 2 children measuring liquids in pints and quarts. It can be used to write mathematics…

An illustration of the concave of a meniscus.

Concave of Meniscus

An illustration of the concave of a meniscus.

An illustration of the convex of a meniscus.

Convex of Meniscus

An illustration of the convex of a meniscus.

The peck, a unit of dry measure.

Peck

The peck, a unit of dry measure.

Illustration of a child with 8 quarts and 1 peck. He is using the baskets to practice measuring. It can be used to write mathematics story problems involving addition, subtraction, money, measurement, and counting.

Child Measuring Using Pecks And Quarts

Illustration of a child with 8 quarts and 1 peck. He is using the baskets to practice measuring. It…

A protractor to measure angles and degrees.

Protractor

A protractor to measure angles and degrees.

A protractor is a semicircular tool for measuring angles in degrees.

Protractor

A protractor is a semicircular tool for measuring angles in degrees.

A protractor indicating a measurement of 10 degrees.

Protractor, 10 Degrees

A protractor indicating a measurement of 10 degrees.

A protractor indicating a measurement of 10 degrees from the right side.

Protractor, 10 Degrees

A protractor indicating a measurement of 10 degrees from the right side.

A protractor indicating a measurement of 100 degrees.

Protractor, 100 Degrees

A protractor indicating a measurement of 100 degrees.

A protractor indicating a measurement of 100 degrees from the right side.

Protractor, 100 Degrees

A protractor indicating a measurement of 100 degrees from the right side.

A protractor indicating a measurement of 105 degrees.

Protractor, 105 Degrees

A protractor indicating a measurement of 105 degrees.

A protractor indicating a measurement of 105 degrees from the right side.

Protractor, 105 Degrees

A protractor indicating a measurement of 105 degrees from the right side.

A protractor indicating a measurement of 110 degrees.

Protractor, 110 Degrees

A protractor indicating a measurement of 110 degrees.

A protractor indicating a measurement of 110 degrees from the right side.

Protractor, 110 Degrees

A protractor indicating a measurement of 110 degrees from the right side.

A protractor indicating a measurement of 115 degrees.

Protractor, 115 Degrees

A protractor indicating a measurement of 115 degrees.

A protractor indicating a measurement of 115 degrees from the right side.

Protractor, 115 Degrees

A protractor indicating a measurement of 115 degrees from the right side.

A protractor with 120 and 60 degree suplementary angles indicated.

Protractor, 120 and 60 Degrees

A protractor with 120 and 60 degree suplementary angles indicated.

A protractor indicating a measurement of 120 degrees.

Protractor, 120 Degrees

A protractor indicating a measurement of 120 degrees.

A protractor indicating a measurement of 120 degrees from the right side.

Protractor, 120 Degrees

A protractor indicating a measurement of 120 degrees from the right side.

A protractor indicating a measurement of 125 degrees.

Protractor, 125 Degrees

A protractor indicating a measurement of 125 degrees.

A protractor indicating a measurement of 125 degrees from the right side.

Protractor, 125 Degrees

A protractor indicating a measurement of 125 degrees from the right side.

A protractor indicating a measurement of 130 degrees.

Protractor, 130 Degrees

A protractor indicating a measurement of 130 degrees.

A protractor indicating a measurement of 130 degrees from the right side.

Protractor, 130 Degrees

A protractor indicating a measurement of 130 degrees from the right side.

A protractor with 135 and 45 degree suplementary angles indicated.

Protractor, 135 and 45 Degrees

A protractor with 135 and 45 degree suplementary angles indicated.

A protractor indicating a measurement of 135 degrees.

Protractor, 135 Degrees

A protractor indicating a measurement of 135 degrees.

A protractor indicating a measurement of 135 degrees from the right side.

Protractor, 135 Degrees

A protractor indicating a measurement of 135 degrees from the right side.

A protractor indicating a measurement of 140 degrees.

Protractor, 140 Degrees

A protractor indicating a measurement of 140 degrees.

A protractor indicating a measurement of 140 degrees from the right side.

Protractor, 140 Degrees

A protractor indicating a measurement of 140 degrees from the right side.

A protractor indicating a measurement of 145 degrees.

Protractor, 145 Degrees

A protractor indicating a measurement of 145 degrees.

A protractor indicating a measurement of 145 degrees from the right side.

Protractor, 145 Degrees

A protractor indicating a measurement of 145 degrees from the right side.

A protractor indicating a measurement of 15 degrees.

Protractor, 15 Degrees

A protractor indicating a measurement of 15 degrees.

A protractor indicating a measurement of 15 degrees from the right side.

Protractor, 15 Degrees

A protractor indicating a measurement of 15 degrees from the right side.

A protractor with 150 and 30 degree suplementary angles indicated.

Protractor, 150 and 30 Degrees

A protractor with 150 and 30 degree suplementary angles indicated.

A protractor indicating a measurement of 150 degrees.

Protractor, 150 Degrees

A protractor indicating a measurement of 150 degrees.

A protractor indicating a measurement of 150 degrees from the right side.

Protractor, 150 Degrees

A protractor indicating a measurement of 150 degrees from the right side.

A protractor indicating a measurement of 155 degrees.

Protractor, 155 Degrees

A protractor indicating a measurement of 155 degrees.

A protractor indicating a measurement of 155 degrees from the right side.

Protractor, 155 Degrees

A protractor indicating a measurement of 155 degrees from the right side.

A protractor indicating a measurement of 160 degrees.

Protractor, 160 Degrees

A protractor indicating a measurement of 160 degrees.

A protractor indicating a measurement of 160 degrees from the right side.

Protractor, 160 Degrees

A protractor indicating a measurement of 160 degrees from the right side.