ClipArt ETC
A boy playing baseball.

Boy playing baseball

A boy playing baseball.

Double threaded screw.

Double Threaded Screw

Double threaded screw.

"Hemholtz constructed a series of resonators, each one of which responds powerfully to a single tone of certain pitch or wavelength. they are metallic vessels, nearly spherical, having an opening, as at A, for the admission of the sound waves." -Avery 1895

Hemholtz Resonator

"Hemholtz constructed a series of resonators, each one of which responds powerfully to a single tone…

Also known as Pinus rigida. The pine cone of a Pitch Pine tree.

Pine Cone of Pitch Pine

Also known as Pinus rigida. The pine cone of a Pitch Pine tree.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

Plane

A carpenter's tool used for paring, smoothing, trunig, and finishing woodwork.

"A screw is a cylinder with a helical proection winding around its circumference. This helix is called the thread of the screw. The distance that a point of the helix is drawn back or advanced in the direction of the length of the screw during one turn is called the pitch of the screw." —Hallock 1905

Using a Screw to Raise Weight

"A screw is a cylinder with a helical proection winding around its circumference. This helix is called…

Illustration of roof and rafter with rise and run to show pitch.

Pitch of Roof

Illustration of roof and rafter with rise and run to show pitch.

Illustration of roof and rafter with rise and run to show pitch.

Pitch of Roof

Illustration of roof and rafter with rise and run to show pitch.

Screw with lead and pitch.

Screw

Screw with lead and pitch.

"A screw cut on a solid, of such form that if any plane be taken through its longitudinal axis, the intersections of the plane by the perimeter are arcs of the pitch-circle of a wheel into which the screw is intended to work. It is so named from having been first employed by Mr. Hindley of York in England." —Whitney, 1889 <p>The hourglass shape of the screw increases the bearing area and therefore reduces wear.

Hindley's Screw

"A screw cut on a solid, of such form that if any plane be taken through its longitudinal axis, the…

Screw-and-Worm gearing is a type of gearing in which the velocity ratio is independent of the radii of the pitch surfaces, the teeth of the wheels essentially being portions of screw surfaces. This kind of gearing is used in speed-reducing arrangements.

Screw-and-Worm Gearing

Screw-and-Worm gearing is a type of gearing in which the velocity ratio is independent of the radii…

Commercial advertisers often seek to generate increased consumption of their products or services through branding, which involves the repetition of an image or product name in an effort to associate related qualities with the brand in the minds of consumers.

Advertising Sign

Commercial advertisers often seek to generate increased consumption of their products or services through…

Single threaded screw.

Single Threaded Screw

Single threaded screw.

Triple threaded screw.

Triple Threaded Screw

Triple threaded screw.

A tuning fork is an acoustic resonator in the form of a two-pronged fork with the tines formed from a U-shaped bar of elastic metal (usually steel). It resonates at a specific constant pitch when set vibrating by striking it against a surface or with an object, and emits a pure musical tone after waiting a moment to allow some high overtones to die out. The pitch that a particular tuning fork generates depends on the length of the two prongs. Its main use is as a standard of pitch to tune other musical instruments.

Tuning Fork

A tuning fork is an acoustic resonator in the form of a two-pronged fork with the tines formed from…