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"The blocks, which are technically known as voussoirs, should be of a wedge shape, the center or top block being the keystone A; the lower blocks B B which rest on the supporting pier are the springers, the upper surface of which is called the skewback, C C; the side blocks, as D, are termed the hauches. The lower surface or soffit of the arch is the intrados, E, and the upper surface the entrados, F. The rise of the arch is the distance from the springing to the soffit, G, the width between the springers is called the span, H, and the radius I. The triangular spaces between the arches are termed spandrils, K." — The Encyclopedia Britannica, 1910

Arch

"The blocks, which are technically known as voussoirs, should be of a wedge shape, the center or top…

"Three center arches, employed in French Flamboyant." — The Encyclopedia Britannica, 1910

Center Arch

"Three center arches, employed in French Flamboyant." — The Encyclopedia Britannica, 1910

"Four center arches, employed in the Perpendicular and Tudor periods." — The Encyclopedia Britannica, 1910

Center Arch

"Four center arches, employed in the Perpendicular and Tudor periods." — The Encyclopedia Britannica,…

"Cusped arch; Christchurch Priory, Hants." — The Encyclopedia Britannica, 1910

Cusped Arch

"Cusped arch; Christchurch Priory, Hants." — The Encyclopedia Britannica, 1910

This fastening device provides a self-contained, tie-down unit by means of which load from a swivel eye is transferred to a base. The fastening device includes a stud, connecting to a base and mounting a collar and a bushing member.

Fastening Device

This fastening device provides a self-contained, tie-down unit by means of which load from a swivel…

"Two wedges have been placed toward one another underneath the weight. Equal force is applied to each wedge which raises the weight." —Quackenbos 1859

Double Wedge

"Two wedges have been placed toward one another underneath the weight. Equal force is applied to each…

"Drop arches, with centers within the arch." — The Encyclopedia Britannica, 1910

Drop Arch

"Drop arches, with centers within the arch." — The Encyclopedia Britannica, 1910

"Upright elliptical arch, sometimes called the egg-shaped arch, employed in Egyptian and Sassanian architecture." — The Encyclopedia Britannica, 1910

Elliptical Arch

"Upright elliptical arch, sometimes called the egg-shaped arch, employed in Egyptian and Sassanian architecture."…

"Equilateral pointed arches, described from two centers, the radius being the whole width of the arch." — The Encyclopedia Britannica, 1910

Equilateral Arch

"Equilateral pointed arches, described from two centers, the radius being the whole width of the arch."…

"Two pieces of metal placed in a hole in a stone which is to be split a wedge-shaped key or plug being driven between them for this purpose." -Whitney, 1911

Feather and Tare

"Two pieces of metal placed in a hole in a stone which is to be split a wedge-shaped key or plug being…

"Flat arch, where the soffit is horizontal and sometimes slightly cambered (dotted line)." — The Encyclopedia Britannica, 1910

Flat Arch

"Flat arch, where the soffit is horizontal and sometimes slightly cambered (dotted line)." — The…

"Pointed foiled arches, in the arcades of Beverley Minister and Netley Abbey." — The Encyclopedia Britannica, 1910

Foiled Arch

"Pointed foiled arches, in the arcades of Beverley Minister and Netley Abbey." — The Encyclopedia…

"Golf clubs. 1, Driver; 2, brassie; 3, putter; 4, cleek; 5, iron; 6, niblick." -Foster, 1921

Golf Clubs

"Golf clubs. 1, Driver; 2, brassie; 3, putter; 4, cleek; 5, iron; 6, niblick." -Foster, 1921

"Pointed horseshoe arches, found in the mosque of Tulun, Cairo, 9th century." — The Encyclopedia Britannica, 1910

Horseshoe Arch

"Pointed horseshoe arches, found in the mosque of Tulun, Cairo, 9th century." — The Encyclopedia…

"Horseshoe arch, with the center above the springing; employed in Moorish architecture." — The Encyclopedia Britannica, 1910

Horseshoe Arch

"Horseshoe arch, with the center above the springing; employed in Moorish architecture." — The Encyclopedia…

"Lancet arches, with centers outside the arch." — The Encyclopedia Britannica, 1910

Lancet Arch

"Lancet arches, with centers outside the arch." — The Encyclopedia Britannica, 1910

A wedge-shaped leaf, tapering gradually to the base.

Cuneate Leaf

A wedge-shaped leaf, tapering gradually to the base.

A wedge is a moveable inclined plane that is used to move heavy materials short distances as shown in the image.

Simple Machine

A wedge is a moveable inclined plane that is used to move heavy materials short distances as shown in…

"Multifoil cusped arch, invented by the Moors at Cordova in the 10th century." — The Encyclopedia Britannica, 1910

Multifoil Arch

"Multifoil cusped arch, invented by the Moors at Cordova in the 10th century." — The Encyclopedia…

"Ogee arches, with curves of counter flexure, found in English Decorated and French Flamboyant." — The Encyclopedia Britannica, 1910

Ogee Arch

"Ogee arches, with curves of counter flexure, found in English Decorated and French Flamboyant." —…

"Argent, a pile, purpure. PILE. An angular figure like a wedge, formed by lines running from the dexter and sinister chief to the middle base." -Hall, 1862

Pile

"Argent, a pile, purpure. PILE. An angular figure like a wedge, formed by lines running from the dexter…

"Argent, a pile, azure. The pile is formed like a wedge, and may be borne wavy, engrailed, &c.; it issues generally from the chief, and extends towards the base, but it may be borne in bend or issue from the base." -Hall, 1862

Pile Ordinary

"Argent, a pile, azure. The pile is formed like a wedge, and may be borne wavy, engrailed, &c.; it issues…

A printers quoin is a device for locking up or fastening type in chases or galleys.

Printers Quoin

A printers quoin is a device for locking up or fastening type in chases or galleys.

"The screw may be considered as a winding wedge; for it has the same relation to a straight wedge that a road, winding up a hill or town, has to a straight road of the same length and activity." — Goodrich, 1844

Screw

"The screw may be considered as a winding wedge; for it has the same relation to a straight wedge that…

"The screw is the sixth and last simple mechanical power. It may be consdered as a modification of the inclined plane, of as a winding wedge." -Comstock 1850

Screw

"The screw is the sixth and last simple mechanical power. It may be consdered as a modification of the…

"Cylinder with a spiral of winding parallel ridges called Threads. If the Threads were unwound from the cylinder, it would be one continuous wedge." —Quackenbos 1859

Screw

"Cylinder with a spiral of winding parallel ridges called Threads. If the Threads were unwound from…

A number of screws, all used in carriage-making and carpentry. "A, B, C, D, and E are special forms of wood-screws in common use." —Whitney, 1889

Collection of Screws Used in Carriage-Making and Carpentry

A number of screws, all used in carriage-making and carpentry. "A, B, C, D, and E are special forms…

"Segmental arch, where the center is below the springing." — The Encyclopedia Britannica, 1910

Segmental Arch

"Segmental arch, where the center is below the springing." — The Encyclopedia Britannica, 1910

"Semicircular arch, he center of which is in the same line with its springers." — The Encyclopedia Britannica, 1910

Semicircular Arch

"Semicircular arch, he center of which is in the same line with its springers." — The Encyclopedia…

Illustrations showing the six mechanical powers: lever, wheel and axle, pulley, inclined plane, wedge, and screw.

Simple Machines

Illustrations showing the six mechanical powers: lever, wheel and axle, pulley, inclined plane, wedge,…

"This wedge has the shape of two inclined planes. Its primary function is splitting or rending objects that it is pressed into. The longer the wedge, the more effective it is." —Quackenbos 1859

Splitting Wedge

"This wedge has the shape of two inclined planes. Its primary function is splitting or rending objects…

"Stilted arches, where the center is below the springing, but the sides are carried down vertically." — The Encyclopedia Britannica, 1910

Stilted Arch

"Stilted arches, where the center is below the springing, but the sides are carried down vertically."…

"The next simple mechanical power is the wedge. This instrument may be considered as two inclined planes, placed base to base." -Comstock 1850

Wedge

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

"A wedge is a triangular prism of hard material, fitted to be driven between objects that are to be separated, or into anything that is to be split." -Avery 1895

Wedge

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

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

Wedge Splitting Wood

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

"The wedge is a movable inclined plane, and is used for moving a great weight a short distance. A common method is shown here." —Hallock 1905

Wedge

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

"This wedge is a movable inclined plane. Allows for raising great weights a short distance." —Quackenbos 1859

Inclined Plane Wedge

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

An illustration of a wedge made of oak. A wedge is a tool used to separate two objects or portions of an object, lift an object, or hold an object in place.

Wedge

An illustration of a wedge made of oak. A wedge is a tool used to separate two objects or portions of…

"The wedge axe (which was one of the first American improvements in edge tools introduced into Europe)." — Encyclopedia Britannica, 1893

Wedge Axe

"The wedge axe (which was one of the first American improvements in edge tools introduced into Europe)."…