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Illustration of a square prism; a prism whose bases are squares.

Square Prism

Illustration of a square prism; a prism whose bases are squares.

Illustration of a pentagonal prism showing, "If a piece of paper is fitted to cover the convex surface of a prism or a cylinder, and then unrolled, its form will be that of a rectangle, as ABCD."

Surfaces Of A Prism

Illustration of a pentagonal prism showing, "If a piece of paper is fitted to cover the convex surface…

Illustration of a cylinder showing, "If a piece of paper is fitted to cover the convex surface of a prism or a cylinder, and then unrolled, its form will be that of a rectangle, as ABCD."

Surfaces Of A Cylinder

Illustration of a cylinder showing, "If a piece of paper is fitted to cover the convex surface of a…

Illustration used to show finding the volume of a triangular prism.

Volume Of Triangular Prism

Illustration used to show finding the volume of a triangular prism.

Illustration used to show finding the volume of a square prism.

Volume Of Square Prism

Illustration used to show finding the volume of a square prism.

Illustration used to show finding the volume of a pentagonal prism.

Volume Of Pentagonal Prism

Illustration used to show finding the volume of a pentagonal prism.

Illustration used to show finding the volume of a pentagonal prism.

Volume Of Cylinder

Illustration used to show finding the volume of a pentagonal prism.

Illustration used to compare the volumes of a pyramid and a prism by emptying sand from the pyramid into the prism.

Comparative Volumes Of A Pyramid And Prism

Illustration used to compare the volumes of a pyramid and a prism by emptying sand from the pyramid…

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 in. rectangular solid.

Similar Rectangular Solids

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…

Various geometric solids, mostly rectangular prisms with a cylinder and a hexagonal prism.

Solids

Various geometric solids, mostly rectangular prisms with a cylinder and a hexagonal prism.

"This was the beginning of a cocoon. Each triangular blade was composed of a great number of small, thin, rectangular plates, taken from the bark of the tree."

Cocoon of Pyralis Corticalis

"This was the beginning of a cocoon. Each triangular blade was composed of a great number of small,…

"This term is applied indiscriminately to evaporators with steam-pipe, whether arranged in the form of a coil, or, as more commonly used, in a rectangular series, In some the steam is admitted through a main pipe, from which others lead off at right angles, terminating in a similar main, which receives and carries off the condensed water of all...Still another, and the most convenient plan, thought not without some objectives, consists in admitting the steam at one end of the coil allowing it to ass progressively through the whole, driving the condensed water, which it will do, though imperfectly, before it." -Commissioner, 1865

Steam-Coil Evaporator

"This term is applied indiscriminately to evaporators with steam-pipe, whether arranged in the form…

"In this mode of evaporating a variety of plans and arrangements for connivence are employed. The pans are made in the form of a shallow box, with a common sheet-iron, galvanized iron, or copper bottom, frequently with flaring sides or shores, on which the scum collects and remains until removed at the convenience of the operator. These pans are frequently made with partitions, which divide them into two or more compartments, into which the juice, as it becomes defecated and partly concentrated in one, is successively transferred to the next." -Commissioner, 1865

Intermittent evaporation process

"In this mode of evaporating a variety of plans and arrangements for connivence are employed. The pans…

"Jacobs evaporator consists of a plain rectangular shallow pan of any convenient length and width, made with a sheet metal bottom and wooden sides. The side pieces are grooved or notched on the inner faces to receive thin board partitions or divisions, extending from side to side, and separating the pan into any convenient number of compartments. These partitions rest loosely upon the bottom, allowing the juice to flow under from one division to the other, while the scum which rises to the surface as the juice moves slowly along, is held back The division boards fit loosely in the grooves in the sides, and may be changed or removed at pleasure." -Commissioner, 1865

Jacobs Pan

"Jacobs evaporator consists of a plain rectangular shallow pan of any convenient length and width, made…

Double Porro prism systems are used in small optical telescopes to re-orient an inverted image, and especially in many binoculars where they both erect the image and provide a longer, folded distance between the objective lenses and the eyepieces.

Porro Prism

Double Porro prism systems are used in small optical telescopes to re-orient an inverted image, and…

A pendentive is a constructive device permitting the placing of a circular dome over a square room or an elliptical dome over a rectangular room. The pendentives, which are triangular segments of a sphere, taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base needed for the dome. In masonry the pendentives thus receive the weight of the dome, concentrating it at the four corners where it can be received by the piers beneath.

Diagram of Pendentives

A pendentive is a constructive device permitting the placing of a circular dome over a square room or…

"Zircon, a mineral composed of of zirconium silicate, sometimes used as a gem-stone... THe mineral crystallizes in the tetragonal system, generally in combinations of square prisms and square pyramids" (Britannica, 1910).

Zircon

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

"Zircon, a mineral composed of of zirconium silicate, sometimes used as a gem-stone... THe mineral crystallizes in the tetragonal system, generally in combinations of square prisms and square pyramids." -Britannica, 1910

Zircon

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

An illustration of a rectangular Anglo-Saxon buckle.

Buckle

An illustration of a rectangular Anglo-Saxon buckle.

An entablature refers to the superstructure of moldings and bands which lie horizontally above columns, resting on their capitals. Entablatures are major elements of classical architecture, and are commonly divided into the architrave, frieze, and the cornice. The architrave (also called epistyle or door frame) is a moulded or ornamental band framing a rectangular opening. It is the lintel or beam that rests on the capitals of the columns.

Architrave of Entablature over Doorway at the Great Temple at Philæ

An entablature refers to the superstructure of moldings and bands which lie horizontally above columns,…

Rectangular block under the soffit of the cornice of the Greek Doric temple, which is studded with guttae. It is supposed to represent the piece of timber through which the wooden pegs were driven in order to hold the rafter in position, and it follows the sloping rake of the roof. In the Roman Doric order the mutule was horizontal, with sometimes a crowning fillet, so that it virtually fulfilled the purpose of the modillion in the Corinthian cornice.

Mutule, Side View

Rectangular block under the soffit of the cornice of the Greek Doric temple, which is studded with guttae.…

Rectangular block under the soffit of the cornice of the Greek Doric temple, which is studded with guttae. It is supposed to represent the piece of timber through which the wooden pegs were driven in order to hold the rafter in position, and it follows the sloping rake of the roof. In the Roman Doric order the mutule was horizontal, with sometimes a crowning fillet, so that it virtually fulfilled the purpose of the modillion in the Corinthian cornice.

Mutule, Front View

Rectangular block under the soffit of the cornice of the Greek Doric temple, which is studded with guttae.…

An illustration of a rectangular cheese-vat.

Rectangular Cheese-vat

An illustration of a rectangular cheese-vat.

Principal forms of the isometric system: rectangular prism.

Rectangular Prism

Principal forms of the isometric system: rectangular prism.

Principal forms of the hexagonal system: dihexagonal prism

Dihexagonal Prism

Principal forms of the hexagonal system: dihexagonal prism

Principal forms of the hexagonal system: hexagonal prism

Hexagonal Prism Second Order

Principal forms of the hexagonal system: hexagonal prism

Principal forms of the hexagonal system: hexagonal prism

Hexagonal Prism First Order

Principal forms of the hexagonal system: hexagonal prism

Principal forms of the hexagonal system: trigonal prism

Trigonal Prism

Principal forms of the hexagonal system: trigonal prism

Principal forms of the hexagonal system: ditrigonal prism

Ditrigonal Prism

Principal forms of the hexagonal system: ditrigonal prism

Principal forms of the triclinic system: triclinic hemi-prism

Triclinic Hemi-prism

Principal forms of the triclinic system: triclinic hemi-prism

The trough battery was a variant of the Voltaic Pile and was invented by William Cruickshank c1800. Volta's battery consisted of brine-soaked pieces of cloth sandwiched between zinc and copper discs, piled stack; this resulted in electrolyte leakage as the weight of the discs squeezed the electrolyte out of the cloth. Cruickshank solved this problem by laying the battery on its side in a rectangular box. The inside of this box was lined with shellac for insulation, and pairs of welded-together zinc and copper were laid out in this box, evenly spaced. The spaces between the plates (the troughs) were filled with dilute sulfuric acid. So long as the box wasn't knocked about, there was no risk of electrolyte spillage.

Trough Battery

The trough battery was a variant of the Voltaic Pile and was invented by William Cruickshank c1800.…

Illustration of an xy grid/graph with grid lines shown. It is the Cartesian coordinate system. Neither axis is labeled.

Blank Coordinate Grid With Grid Lines Shown

Illustration of an xy grid/graph with grid lines shown. It is the Cartesian coordinate system. Neither…

Illustration of an xy grid/graph with grid lines shown. It is the Cartesian coordinate system with both axes labeled.

Coordinate Grid With Axes Labeled And Grid Lines Shown

Illustration of an xy grid/graph with grid lines shown. It is the Cartesian coordinate system with both…

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

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…

Illustration of the projection of a rectangular prism that is represented as if it were standing on one of its small ends, with the broad side toward the observer.

Projection Of Rectangular Prism

Illustration of the projection of a rectangular prism that is represented as if it were standing on…

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its triangular sides.

Projection Of Wedge

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its triangular…

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its rectangular sides.

Projection Of Wedge

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its rectangular…

Illustration of the projection of a wedge of a rectangular prism that is viewed from the side.

Projection Of Wedge

Illustration of the projection of a wedge of a rectangular prism that is viewed from the side.

Illustration of the projection of a hexagonal prism.

Projection Of Hexagonal Prism

Illustration of the projection of a hexagonal prism.

Illustration of the projection of a hexagonal prism.

Projection Of Hexagonal Prism

Illustration of the projection of a hexagonal prism.

Illustration of the projection of a rectangular prism whose broad side makes an angle of 30° with the horizontal.

Projection Of Rectangular Prism

Illustration of the projection of a rectangular prism whose broad side makes an angle of 30° with…

Illustration of the projection of a rectangular prism whose base makes an angle of 160° with the horizontal.

Projection Of Rectangular Prism

Illustration of the projection of a rectangular prism whose base makes an angle of 160° with the…

Illustration of the projection of a rectangular prism whose base makes an angle of 17.5° with the horizontal.

Projection Of Rectangular Prism

Illustration of the projection of a rectangular prism whose base makes an angle of 17.5° with the…

Illustration of the projection of a hexagonal prism having two of its parallel sides parallel to the plane of the paper, and its axis vertical. instead of a side elevation at right angles to the horizontal, the angle is 30° with the horizontal.

Projection Of Hexagonal Prism

Illustration of the projection of a hexagonal prism having two of its parallel sides parallel to the…

Illustration of the projection of a hexagonal prism whose axis is parallel to the plane of the paper and whose base makes and angle of 30° with the horizontal.

Projection Of Hexagonal Prism

Illustration of the projection of a hexagonal prism whose axis is parallel to the plane of the paper…

Illustration of the intersection of a quadrangular prism and an octagonal prism. The figures intersect at a right angle.

Intersecting Prisms

Illustration of the intersection of a quadrangular prism and an octagonal prism. The figures intersect…

Illustration of the intersection of an octagonal prism and a cylinder. The figures intersect at an oblique angle.

Intersecting Prism and Cylinder

Illustration of the intersection of an octagonal prism and a cylinder. The figures intersect at an oblique…

Illustration of the development of a rectangular prism. "Assume now that the prism is laid on the drawing board, the surface A face down, and the paper covering removed by turning the prism over and over, the paper remaining on the surface of the drawing board, as shown..."

Development Of Rectangular Prism

Illustration of the development of a rectangular prism. "Assume now that the prism is laid on the drawing…

Illustration showing the intersection of a plane with an octagonal prism.

Plane Intersecting Octagonal Prism

Illustration showing the intersection of a plane with an octagonal prism.

Illustration of a trigonometric grid with a domain from -π to π and a range from -1 to 1. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -1 to 1

Illustration of a trigonometric grid with a domain from -π to π and a range from -1 to 1. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -2 to 2. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -2 to 2

Illustration of a trigonometric grid with a domain from -π to π and a range from -2 to 2. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -3 to 3. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -3 to 3

Illustration of a trigonometric grid with a domain from -π to π and a range from -3 to 3. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -4 to 4. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -4 to 4

Illustration of a trigonometric grid with a domain from -π to π and a range from -4 to 4. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -5 to 5. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -5 to 5

Illustration of a trigonometric grid with a domain from -π to π and a range from -5 to 5. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -6 to 6. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -6 to 6

Illustration of a trigonometric grid with a domain from -π to π and a range from -6 to 6. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -7 to 7. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -7 to 7

Illustration of a trigonometric grid with a domain from -π to π and a range from -7 to 7. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -8 to 8. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -8 to 8

Illustration of a trigonometric grid with a domain from -π to π and a range from -8 to 8. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -9 to 9. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -9 to 9

Illustration of a trigonometric grid with a domain from -π to π and a range from -9 to 9. The…

Illustration of a trigonometric grid with a domain from -π to π and a range from -10 to 10. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -π to π And Range -10 to 10

Illustration of a trigonometric grid with a domain from -π to π and a range from -10 to 10. The…

Illustration of a trigonometric grid with a domain from -2π to 2π and a range from -1 to 1. The increments on the x-axis are marked in intervals of ½π.

Trigonometry Grid With Domain -2π to 2π And Range -1 to 1

Illustration of a trigonometric grid with a domain from -2π to 2π and a range from -1 to 1. The…