Froebel's Divided Cube (Complex)
This image shows one of Friedrich Froebel's divided cube (this one divided into many smaller cubes and…
Hexagonal Prism
"Science has succeeded in classifying the thousands of known crystals in six systems, to each of which…
Hexagonal Prism and Basal Pinacoid
"...shows a combination of a hexagonal prism (m) with the basal pinacoid (c)." -The Encyclopedia Britannica…
Hexagonal Prism of the First Order
"Hexagonal prism of the first order, consisting of six faces also parallel to the hexad axis, but perpendicular…
Development of Hexagonal Prism
An illustration of a hexagonal prism rolled out, or "stretched out" in the straight line AB.
Holophotal Catadioptric
"Holophotal Catadioptric Apparatus Revolving round a Central Flame." —The Encyclopedia Britannica,…
Hydrous Nickel Sulphate
This form shows the planes given on a crystal of hydrous nickel sulphate: the basal pinacoid, (c); three…
Lead Tungstate
Also known as Stolzite, this crystal is bounded by the unit pyramid of the first order, P, {111} (o),…
Lenses of Various Forms
"a, prism; b, plane glass; c, spherical lens; d, double-convex; e, plano-convex, f, double-concave;…
Macro-prism and Brachy-pinacoid
"This consists of four faces parallel to the brachy axis." -The Encyclopedia Britannica 1910
Marcasite
"Orthorhombic. Crystals commonly tabular parallel to basal plane, showing also short prisms and low…
Development Exercise of Octagonal Light Shade
A problem exercise creating a stretched out or developed image of the octagonal light shade by using…
Development Exercise of Octagonal Roof and True Shape of Rafter
Problem exercise in drawing a development or a stretchout image of the octagonal roof and finding the…
Orthoclase
"Monoclinic. Crystals are usually prismatic in habit and have as prominent forms, clinopinacoid, base,…
Orthorhombic Crystal of Olivine
This is an orthorhombic crystal of olivine. It is formed by the orthorhombic prism in combination with…
Orthorhombic Crystal of Topaz
This form shows the fundamental prism (p) on a crystal of topaz, in combination with another prism,…
Equal and Parallel Opposite Faces of a Parallelopiped
Diagram used to prove the theorem: "The opposite faces of a parallelopiped are equal and parallel."
Parallelopiped with Plane Passing Through
Illustration of a parallelopiped with a plane passing through two diagonally opposite edges. The plane…
Parallelopiped with Plane Passing Through
Illustration of a parallelopiped with a plane passing through two diagonally opposite edges. The plane…
Parallelopiped Showing Volume
Illustration of a parallelopiped (a prism with a parallelogram as its base) used to demonstrate that…
Parallelopipedon
"A parallelopipedon is a prism whose bases (ends) are parallelograms." —Hallock 1905
Relationship Between 2 Parallelopipeds With Equal Altitudes
Diagram used to prove the theorem: "The rectangular parallelopipeds which have two dimensions in common…
Relationship Between Dimensions of Parallelopipeds
Diagram used to prove the theorem: "The rectangular parallelopipeds are to each other as the product…
Volume of Parallelopiped
Diagram used to prove the theorem: "The volume of a any parallelopiped is equal to the product of its…
Volume of Rectangular Parallelopiped
Diagram used to prove the theorem: "The volume of a rectangular parallelopiped is equal to the product…
Phenacite
This crystal is mainly terminated by a rhombohedron of the third order, (x). With this form are associated…
Primitive Crystal
"If the base is a square and the prism stands erect—that is, if its sides or lateral planes, as…
Primitive Crystal
"When the base is a rectangle instead of a square, the form is a right rectangular prism." —The…
Primitive Crystal
"When the base is a rhombus, and the prism stands erect, the form is a right rhombic prism." —The…
Primitive Crystal
"When the base is a rhomboid, and the prism stands erect, it is only the opposite laeral faces that…
Prism
A transparent body, with usually three sides and two equal and parallel triangular ends or bases.
Prism
"A prism is a transparent body with two refraction surfaces that lie in intersecting planes. The angle…
Prism
"A prism is a piece of glass, having for its sides three plane surfaces and for its ends two equal and…
Prism
Illustration of a prism - a polyhedron of which two faces are equal polygons in parallel planes, and…
Pentagon Development Prism Exercise
An exercise developed to draw a rolled out or development of the pentagon prism in a 4" by 5" surface.
Pentagonal Prism Development Exercise
An exercise in drawing a pentagonal prism development or rolled out image in a 4" by 5" area.
Triangular Prism Development Exercise
An illustration to exercise a stretched out, or development, image of the triangular prism using 4"…
Triangle Prism Exercise
An illustration to draw triangle prism's development, or stretched out surfaces, in a 4" by 5" surface.
Prism Spectroscope from the Late 19th Century
"...a tube with a slit at the further end through which the light enters, and at the other end a collimating…
Cathetal Prism
"Cathetal prisms readily yield the phenomena of total reflection as shown, and are often used when light…
Ditetragonal prism
"The dietetragonal prism is a form consisting of eight rectangular vertical faces, each of which intersects…
Dihexagonal prism
"The dihexagonal prism has twelve rectangular vertical faces, each of which intersects all three of…
First order prism
"The prism of the first order consists of four rectangular vertical faces, each of which intersects…
Lateral Area of A Prism
Diagram used to prove the theorem: "The lateral area of a prism is equal to the product of a lateral…
Orthohombie prism
"Crystal faces are described according to their relations to the crystallographic axes. A series of…
Second order prism
"The prism of the second order consists of four rectangular vertical faces, each of which intersects…