This image shows one of Friedrich Froebel's divided cube (this one divided into many smaller cubes and…

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

"...shows a combination of a hexagonal prism (m) with the basal pinacoid (c)." -The Encyclopedia Britannica…

"Hexagonal prism of the first order, consisting of six faces also parallel to the hexad axis, but perpendicular…

An illustration of a hexagonal prism rolled out, or "stretched out" in the straight line AB.

"Holophotal Catadioptric Apparatus Revolving round a Central Flame." —The Encyclopedia Britannica,…

This form shows the planes given on a crystal of hydrous nickel sulphate: the basal pinacoid, (c); three…

Also known as Stolzite, this crystal is bounded by the unit pyramid of the first order, P, {111} (o),…

"a, prism; b, plane glass; c, spherical lens; d, double-convex; e, plano-convex, f, double-concave;…

"This consists of four faces parallel to the brachy axis." -The Encyclopedia Britannica 1910

"Orthorhombic. Crystals commonly tabular parallel to basal plane, showing also short prisms and low…

A problem exercise creating a stretched out or developed image of the octagonal light shade by using…

Problem exercise in drawing a development or a stretchout image of the octagonal roof and finding the…

"Monoclinic. Crystals are usually prismatic in habit and have as prominent forms, clinopinacoid, base,…

This is an orthorhombic crystal of olivine. It is formed by the orthorhombic prism in combination with…

This form shows the fundamental prism (p) on a crystal of topaz, in combination with another prism,…

Diagram used to prove the theorem: "The opposite faces of a parallelopiped are equal and parallel."

Illustration of a parallelopiped with a plane passing through two diagonally opposite edges. The plane…

Illustration of a parallelopiped with a plane passing through two diagonally opposite edges. The plane…

Illustration of a parallelopiped (a prism with a parallelogram as its base) used to demonstrate that…

"A parallelopipedon is a prism whose bases (ends) are parallelograms." —Hallock 1905

Diagram used to prove the theorem: "The rectangular parallelopipeds which have two dimensions in common…

Diagram used to prove the theorem: "The rectangular parallelopipeds are to each other as the product…

Diagram used to prove the theorem: "The volume of a any parallelopiped is equal to the product of its…

Diagram used to prove the theorem: "The volume of a rectangular parallelopiped is equal to the product…

This crystal is mainly terminated by a rhombohedron of the third order, (x). With this form are associated…

"If the base is a square and the prism stands erect—that is, if its sides or lateral planes, as…

"When the base is a rectangle instead of a square, the form is a right rectangular prism." —The…

"When the base is a rhombus, and the prism stands erect, the form is a right rhombic prism." —The…

"When the base is a rhomboid, and the prism stands erect, it is only the opposite laeral faces that…

A transparent body, with usually three sides and two equal and parallel triangular ends or bases.

"A prism is a transparent body with two refraction surfaces that lie in intersecting planes. The angle…

"A prism is a piece of glass, having for its sides three plane surfaces and for its ends two equal and…

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

An exercise developed to draw a rolled out or development of the pentagon prism in a 4" by 5" surface.

An exercise in drawing a pentagonal prism development or rolled out image in a 4" by 5" area.

An illustration to exercise a stretched out, or development, image of the triangular prism using 4"…

An illustration to draw triangle prism's development, or stretched out surfaces, in a 4" by 5" surface.

"...a tube with a slit at the further end through which the light enters, and at the other end a collimating…

"Cathetal prisms readily yield the phenomena of total reflection as shown, and are often used when light…

"The dietetragonal prism is a form consisting of eight rectangular vertical faces, each of which intersects…

"The dihexagonal prism has twelve rectangular vertical faces, each of which intersects all three of…

"The prism of the first order consists of four rectangular vertical faces, each of which intersects…

Diagram used to prove the theorem: "The lateral area of a prism is equal to the product of a lateral…

"Crystal faces are described according to their relations to the crystallographic axes. A series of…

"The prism of the second order consists of four rectangular vertical faces, each of which intersects…