### Intersecting Planes

The intersection of two planes is a straight line.

### Intersecting Planes

The intersection of two planes is a straight line.

### Intersecting Planes

The intersection of two planes is a straight line.

### Intersecting Planes

The intersection of two planes is a straight line.

### Intersecting Planes

Two intersecting planes on a third plane. "If two intersecting planes are each perpendicular to a third…

### Intersecting Planes

Illustration of two intersecting planes.

### Parallel Planes

Illustration of two parallel planes. "Two planes perpendicular to the same straight line are parallel."

### Parallel Planes

Two parallel planes cut by a third plane.

### Parallel Planes

Two parallel planes perpendicular to a line (AB). "A straight line perpendicular to one of two parallel…

### Parallel Planes Cut By 2 Lines

Three parallel planes cut by two lines.

### Parallel Planes

"If two intersecting lines are each parallel to a given plane, the plane of these lines is parallel…

### Perpendicular Planes

"If two planes are perpendicular to each other, a line in one of them perpendicular to the intersection…

### Plant House

"The glass roof is commonly designed so as to form a uniform plane or slope from back to front in lean-to…

### Draw Polygon

Draw the plan and elevation of a polygon of which the real shape and position in a given plane are known.

### Prism

Illustration of a prism - a polyhedron of which two faces are equal polygons in parallel planes, and…

### Intersection of a Prism and a Plane

Illustration of the intersection of a prism and a plane.

### Hand with Proof-plane

"A proof-plane may be made by cementing a bronze cent or a disk of gilt paper to a thin insulating handle,…

### Pulley

Pair of circular pulleys connected b a cord, showing the range of motion as arcs

### Pyramid

"If a pyramid be cut by a plane, parallel to the base, so as to form two parts, the lower part is called…

### Using a Screw to Raise Weight

"A screw is a cylinder with a helical proection winding around its circumference. This helix is called…

### Ratchet Brace

"A ratchet brace is a powerful instrument, and carries in itself the screw for obtaining the requisite…

### Divergent Rays

"From the surface of a plane mirror, parallel rays are reflected parallel; but the convex mirror causes…

### Rectangular Pyramid Cut By Plane

Illustration of a right rectangular pyramid that has been cut by a plane parallel to the base. The lower…

### Rectangular Pyramid Cut By Plane

Illustration of a right rectangular pyramid that has been cut by a plane parallel to the base. The top…

### Rectangular Pyramid Cut By Plane

Illustration of a right rectangular pyramid that has been cut by a plane parallel to the base. The top…

### Rectangular Pyramid Cut By Plane

Illustration of a right rectangular pyramid that has been cut by a plane parallel to the base. The lower…

### Frustum Of A Rectangular Pyramid

Illustration of a right rectangular pyramid that has been cut by a plane parallel to the base. The top…

### Frustum Of A Rectangular Pyramid

Illustration of a right rectangular pyramid that has been cut by a plane parallel to the base. The top…

### Frustum Of A Rectangular Pyramid

Illustration of a right hollow rectangular pyramid that has been cut by a plane parallel to the base.…

### Frustum Of A Rectangular Pyramid

Illustration of a right hollow rectangular pyramid that has been cut by a plane parallel to the base.…

### Frustum Of A Rectangular Pyramid With Hole

Illustration of a frustum of a pyramid having a rectangular base and a hole passing through the center…

### Popcorn Box Frustum Of A Rectangular Pyramid

Popcorn box that is in the shape of a frustum of a rectangular pyramid.

### Repeating Light

"Plane mirrors M revolve on an endless chain placed outside of the apparatus and alter the direction…

### Intersection of Surface of Revolution and Plane

"A series of planes as S—S are passed perpendicular to the axis of revolution, cutting out the…

### Section of Rolling Surfaces

Illustration showing a section of the rolling surfaces by a plane perpendicular to their straight line…

### Airplane Rudder and Elevator

A propeller airplane with rudder, elevator, and ailerons. The rudder stabilizes the plane vertical,…

### Diagram of a screw

"That the screw is a modified inclined plane, may be shown by winding a triangular piece of paper around…

### Hindley's Screw

"A screw cut on a solid, of such form that if any plane be taken through its longitudinal axis, the…

### Septagonal/Heptagonal Pyramid Cut By Plane

Illustration of a right septagonal/heptagonal pyramid, with hidden edges shown, that has been cut by…

### Frustum Of A Septagonal/Heptagonal Pyramid

Illustration of a septagonal/heptagonal pyramid that has been cut by a plane parallel to the base. The…

### Smoothing Plane

"The smoothing plane." — Encyclopedia Britannica, 1893

### Intersecting Spheres

Illustration of two intersecting spheres. "The intersection of two spherical surfaces is the circumference…

### Logarithmic Spiral Sector

In this illustration, "the driven surface of the slide coincides with the tangent to the spiral, the…

### Square And Circle

An illustration used to "square a cirleplane".

### Intersection of Square Pyramid and a Plane

Illustration of the intersection of a square pyramid and a plane.

### Intersection of Square Pyramid and a Plane

Illustration of the intersection of a square pyramid and a plane.

### Stock

"The wood-worker's main stand-by for boring is the stock or brace and set of bits." — Encyclopedia…

### Stringfellow's Flying Machine

An early invention of the airplane, created by John Stringfellow in the mid-19th century.

### Motion of Translation

Illustration showing the motion of translation of two parallel motions.

### Intersection of Triangular Pyramid and a Plane

Illustration of the intersection of a triangular pyramid and a plane.

The desire to reproduce in wood these old stone ornaments led to the invention of a great number of…

### Universal Plane

The desire to reproduce in wood these old stone ornaments led to the invention of a great number of…

### Wedge

"The next simple mechanical power is the wedge. This instrument may be considered as two inclined planes,…

### Wedge

"A wedge is a triangular prism of hard material, fitted to be driven between objects that are to be…

### Wedge Splitting Wood

"[A wedge] is simply a movable inclined plane, or two such planes united a their bases." -Avery 1895

### Wedge

"The wedge is a movable inclined plane, and is used for moving a great weight a short distance. A common…

### Inclined Plane Wedge

"This wedge is a movable inclined plane. Allows for raising great weights a short distance." —Quackenbos…