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Sometimes it is not necessary for an entire wheel to be used. A projection of any kind that can cause an object to move in a circle may be considered a wheel, like in the image given.

Bucket and Crank

Sometimes it is not necessary for an entire wheel to be used. A projection of any kind that can cause…

Motor that converts thermal energy to mechanical work

Internal Combustion Engine

Motor that converts thermal energy to mechanical work

Mechanism that connects the coupler to the frame of the car. In model railroading, the coupler mounting box is often so-named.

Draft Gear

Mechanism that connects the coupler to the frame of the car. In model railroading, the coupler mounting…

"GIN-BLOCK. A simple form of tackle-block with a single wheel, over which a rope runs. It has a hook by which it swings from the jib of a crane or the sheer of a gin." -Whitney, 1911

Gin-Block

"GIN-BLOCK. A simple form of tackle-block with a single wheel, over which a rope runs. It has a hook…

An example of a simple machine. In the figure, AC is the included plane, CB is the height of the plane, BA is its base, and BAC is the angle of inclination or elevation. The power necessary to sustain any weight on an included plane is to the weight as the height of the plane to its length, or as CB to CA.

Inclined Plane

An example of a simple machine. In the figure, AC is the included plane, CB is the height of the plane,…

"The lever of the first class has the fulcrum between the power and the weight." Examples: a common crowbar, a pump handle, scissors, a seesaw. -Foster, 1921

First Class Lever

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

"The lever of the second class has the weight between the power and the fulcrum." Examples: a nutcracker, a wheelbarrow. -Foster, 1921

Second Class Lever

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

Signal Lever and Interlocking Tappet. F - Floor of Cabin G - Grove for interlocking bar N - Tappet V - Latch rod

Signal Lever

Signal Lever and Interlocking Tappet. F - Floor of Cabin G - Grove for interlocking bar N - Tappet V…

"The lever of the third class has the power between the weight and the fulcrum." Examples: sewing machine treadle, forearm. -Foster, 1921

Third Class Lever

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

A wheel and axle has two cylinders of different diameters that are connected so that they turn about a common axis. P is power, W is weight. The right figure is the front view of the left figure.

Simple Machine

A wheel and axle has two cylinders of different diameters that are connected so that they turn about…

A simple inclined plane. The power multiplied by the length of the plane equals the weight multiplied by the height of the plane

Simple Machine

A simple inclined plane. The power multiplied by the length of the plane equals the weight multiplied…

An inclined plane with a different pulley system layout.

Simple Machine

An inclined plane with a different pulley system layout.

An inclined plane with an inverted pulley system. No rule can be given for the ratio of power to weight. It can be explained using the principle of resolution of forces.

Simple Machine

An inclined plane with an inverted pulley system. No rule can be given for the ratio of power to weight.…

A wedge is a moveable inclined plane that is used to move heavy materials short distances as shown in the image.

Simple Machine

A wedge is a moveable inclined plane that is used to move heavy materials short distances as shown in…

A screw is a cylinder with a groove wrapped helically around its circumference. The groove is called a thread and the distance that the thread is drawn is the pitch.

Simple Machine

A screw is a cylinder with a groove wrapped helically around its circumference. The groove is called…

Device which converts hydraulic fluid power into mechanical force and motion by transfer of flow under pressure. It usually provided rotary mechanical motion.

Hydraulic Motor

Device which converts hydraulic fluid power into mechanical force and motion by transfer of flow under…

Any sound-reproducing machine using records in the form of cylinders or discs.

Machine for Phonograph

Any sound-reproducing machine using records in the form of cylinders or discs.

"A small wheel turning upon an axis." -Foster, 1921

Pulley

"A small wheel turning upon an axis." -Foster, 1921

A diagram illlustrating the principal of the screw.

Diagram of a Screw

A diagram illlustrating the principal of the screw.

An illustration of a wedge made of oak. A wedge is a tool used to separate two objects or portions of an object, lift an object, or hold an object in place.

Wedge

An illustration of a wedge made of oak. A wedge is a tool used to separate two objects or portions of…