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Air pump used for taking the air out of a vessel.

Single Barrel Air Pump

Air pump used for taking the air out of a vessel.

An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office. It is generally comfortable and adjustable and can swivel 360 degrees.

Adjustable Office Chair

An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office.…

"A heavy-current (2000 amp.) 650-volt, single-pole overload circuit breaker (General Electric Company, type C, form K2)." —Croft 1920

Circuit Breaker

"A heavy-current (2000 amp.) 650-volt, single-pole overload circuit breaker (General Electric Company,…

An illustration of a single dahlia flower. Dahlia is a genus of bushy, tuberous, perennial plants native to Mexico, Central America, and Colombia. There at least 36 species of Dahlia. Dahlia hybrids are commonly grown as garden plants. The Aztecs gathered and cultivated the dahlia for food, ceremony, as well as decorative purposes, and the long woody stem of one variety was used for small pipes

Dahlia

An illustration of a single dahlia flower. Dahlia is a genus of bushy, tuberous, perennial plants native…

"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…

"The shape of the double convex lens, d, c, is that of two plano-convex lenses, placed with their plane surfaces in contact, and consequently the focal distance of this lens is nearly the centre of the sphere of which one of its surfaces is a part." -Comstock 1850

Double Convex Lens

"The shape of the double convex lens, d, c, is that of two plano-convex lenses, placed with their plane…

"Single large cylinder press, 1832-1900." -Hill, 1921

Single Large Cylinder Press

"Single large cylinder press, 1832-1900." -Hill, 1921

"Single small cylinder press, 1835-1900." -Hill, 1921

Single Small Cylinder Press

"Single small cylinder press, 1835-1900." -Hill, 1921

In military affairs, a narrow ditch or trench by which approach is made to a fortress or designed place when within range of fire. This is a section of single sap, showing portion of gabions.

Single Sap

In military affairs, a narrow ditch or trench by which approach is made to a fortress or designed place…

"In the single moveable pulley, the same rope passes from the fixed point, A, to the power, P. It is evident here, that the weight, W, ten pounds, five pounds will be supported by one string, and five by the other. The power will then support twice its own weight." -Comstock 1850

Single Movable Pulley

"In the single moveable pulley, the same rope passes from the fixed point, A, to the power, P. It is…

Single threaded screw.

Single Threaded Screw

Single threaded screw.

Lefthand single thread worm and worm wheel.

Worm And Worm Wheel

Lefthand single thread worm and worm wheel.

Righthand single thread worm and worm wheel.

Worm And Worm Wheel

Righthand single thread worm and worm wheel.