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The barker's mill is a device that rotates as water is poured in at top and comes out in opposite directions at the bottom.

Barker's Mill

The barker's mill is a device that rotates as water is poured in at top and comes out in opposite directions…

A lathe is a machine tool which spins a block of material to perform various operations such as cutting, sanding, knurling, drilling, or deformation with tools that are applied to the workpiece to create an object which has symmetry about an axis of rotation.

Foot-power Wood-working Lathe

A lathe is a machine tool which spins a block of material to perform various operations such as cutting,…

A gyroscope that is rotated to form an ellipse.

Gyroscope

A gyroscope that is rotated to form an ellipse.

"Extend the arm horizontally toward the platoon leader; describe small circles with the hand." — Moss, 1914

Hand signal

"Extend the arm horizontally toward the platoon leader; describe small circles with the hand." —…

A lathe is a machine tool which spins a block of material to perform various operations such as cutting, sanding, knurling, drilling, or deformation with tools that are applied to the workpiece to create an object which has symmetry about an axis of rotation.

Large Power Lathe

A lathe is a machine tool which spins a block of material to perform various operations such as cutting,…

A pulley is a mechanism of a wheel on an axle or shaft that may have a groove between two flanges around its circumference. A rope usually runs over the wheel and inside the groove, if present.

Sash Pulley

A pulley is a mechanism of a wheel on an axle or shaft that may have a groove between two flanges around…

A woman spinning cotton on a spinning jenny.

Spinning Jenny

A woman spinning cotton on a spinning jenny.

Spinning Wheel used to make thread.

Spinning Wheel

Spinning Wheel used to make thread.