Illustration of a prism used to demonstrate that the volume of any prism is equal to the product of…

Diagram used to prove the theorem: "The volume of a prismatoid is equal to the product of one-sixth…

Illustration of 4 congruent rectangular prisms placed in the shape of a square. They are arranged to…

Illustration showing two prisms are equal if the three faces which include a trihedral angle of the…

Illustration of an oblique prism constructed by the combination of three truncated prisms.

Diagram used to prove the theorem: "Two prisms are equal when the three faces about a trihedral of one…

A sample exercise problem in completing the top part of the hexagonal pyramid and to create a development,…

A sample exercise problem to complete the top part and create a stretched out image of the oblique hexagonal…

A pentagonal pyramid problem exercise to complete the top view of the image, and development, or rolled…

The problem exercise in completing the top view and creating the development, or rolled out, image of…

Illustration of the isometric of an oblique pentagonal pyramid.

Illustration of triangular pyramid used to show that the volume is the limit of the sum of the volumes…

A bow of prismatic colors formed from the reflection and refraction of the sun and water. In the diagram,…

Illustration of a 5 in. by 3 in. by 4 in. rectangular solid with each cube in the solid representing…

Illustration of a 1 in. by 2 in. by 1 in. rectangular solid that is similar to a 2 in. by 4 in. by 2…

"Fresnel next conceived the admirable improvement of employing the principle of "total" or internal…

"Cross-section of prismatic reflector, showing how light rays are refracted and dispersed." —Croft…

"The prism will deflect the red and orange, and form a reddish colored image at n. The violet, indigo,…

"Science has succeeded in classifying the thousands of known crystals in six systems, to each of which…

This figure shows a combination of forms sometimes observed on the silicate Scapolite, with the unit…

"This is a form consisting of six rectangular vertical faces, each of which intersects two of the horizontal…

"Science has succeeded in classifying the thousands of known crystals in six systems, to each of which…

"Science has succeeded in classifying the thousands of known crystals in six systems, to each of which…

"Solar Spectrum.—If a ray, proceeding from the sun, be admitted into a darkened chamber, through…

Illustration of an oblique view of a rectangular solid/prism at 30°.

Illustration of an oblique view of a rectangular solid/prism at 45°.

Illustration of an oblique view of a rectangular solid/prism at 60°.

Illustration of model created by combining non regular geometric solids.

"An instrument used chiefly to measure the angular deviation of light rays in passing through a prism,…

"C. Collimator; P, center of group of prisms; T, telescope; s, slit through which the ray of light enters,…

"...an instrument which gives a spectrum when the source of the light is in a straight line with the…

"A prism is used to disperse ordinary light, and slits are cut in paper S to only allow yellow and blue…

Illustration of stairs; 3-dimensional view of 4 steps. The staircase can be created by combining/stacking…

"Orthohombic. Habit prismatic, showing usually a combination of prism with large angle, brachypinacoid,…

"In 1835 Mr. Stevenson, in a report to the Northern Lighthouse Board, proposed to add fixed reflecting…

"Condensing Straight Prisms.—These, either by reflexion or refraction or both, cause a ray fr…

"Professor Swan's Designs.—Among several ingenious arrangements and new forms of agents proposed…

The exercise problem of creating a three piece elbow development or rolled out image of the cylinder…

This crystal of Tourmaline exhibits hemimorphism in the direction of the vertical axis. Its forms are…

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

Exercise problem to develop, or rolled out, image of the triangular pyramid by creating an equal length…

Diagram used to prove the theorem: "The volume of a triangular pyramid is equal to one third of a triangular…

"Condensing Twin Prism Light.—Part of the Lamiash light in the Firth of Clyde. Its action will…

This illustration shows the union of a pyramid and a prism of different orders.

This illustration shows the union of a pyramid and a prism of the same order.

"Tetragonal. Prismatic in habit. Often vertically striated. Common forms are prisms of first and second…

This form shows a very complex combination of thirteen tetragonal forms occuring on the mineral Vesuvianite:…

Also known as Fergusonite, this crystal shows the basal pinacoid, (c); the unit pyramid, (s); and the…

"A crystal of zincite with a prism terminated by a pyramid above a basal pinacoid below." — Ford,…

"Zircon, a mineral composed of of zirconium silicate, sometimes used as a gem-stone... THe mineral crystallizes…