ClipArt ETC
An illustration of a screw, which is incline plane wrapped around a cyclinder.

Screw

An illustration of a screw, which is incline plane wrapped around a cyclinder.

An illustration of a screw, which is incline plane wrapped around a cyclinder.

Screw

An illustration of a screw, which is incline plane wrapped around a cyclinder.

"To show how a shadow if a perpendicular object is to be projected on an inclined plane." -Benson, 1891

Shadow of a Perpendicular Object

"To show how a shadow if a perpendicular object is to be projected on an inclined plane." -Benson, 1891