"A small projection in machinery, used to impart motion. *C. wheel*, a wheel having cogs on its…

Illustration showing the intersection of a plane with a cone. The solid is shown in perspective and…

Illustration of the method of finding the projection, in the form of an ellipse, of the top of a cylinder…

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together,…

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together,…

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together,…

"Here the plane of projection is tangent to the sphere, and normals to all the faces are drawn fro mthe…

The three points in which any line cuts the sides of a triangle and the projections, from any point…

To find the angle between two given lines a, b of which the projections a1, b1 and a2, b2 are given.

To find the projections of a line which joins two points, A, B given by their projections.

Projections of a line inclined to both the horizontal and vertical planes will not show its true length,…

CD is the projection of AB upon OX. In each case AE=CD and AE=ABcos theta.

Illustration showing the development of a sphere by the perspective of its resolved cones.

Projection of a square bar with a cylindrical portion.

"...in this figure the thicker lines are the projections of the three planes of symmetry, and on these…

Projections of a triangular prism or block with a square hole.

Projections and development of a truncated cylinder.