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"If the strong tube, or barrel, be smooth, and equal on the inside, and there be fitted to it the solid piston, or plug a, so as to work up and down, air tight, by the handle b, the air in the barrel may be compressed into a space a hundred times less than its usual bulk. Indeed, if the vessel be of sufficient strength, and the force employed sufficiently great, its bulk may be lessened a thousand times, or in any proportion, according to the force employed; and if kept in this state for years, it will regain its former bulk the instant the pressure is removed." —Comstock, 1850

Compression Experiment

"If the strong tube, or barrel, be smooth, and equal on the inside, and there be fitted to it the solid…

Cork material is an impermeable, buoyant material, a prime-subset of generic cork tissue that is harvested for commercial use primarily from Quercus suber that is endemic to southwest Europe and northwest Africa. Cork is composed of suberin, a hydrophobic substance, and because of its impermeability, buoyancy, elasticity, and fire resistance, it is used in a variety of products, the most common of which is for wine stoppers.

Cork Bottle Stopper

Cork material is an impermeable, buoyant material, a prime-subset of generic cork tissue that is harvested…

"Edison fuse plugs and casings for switchboard use." —Croft 1920

Casing and Fuse Plugs

"Edison fuse plugs and casings for switchboard use." —Croft 1920

"Edison fuse plug cutout for switchboard use." —Croft 1920

Edison Fuse Plug Cut-Out

"Edison fuse plug cutout for switchboard use." —Croft 1920

Gray & Davis starting motor with reduction gearing for open flywheel. 1-Motor Pinion; 2-Intermediate Gear; 5-Intermediate Shaft; 6-Sliding Pinion; 7-Shifter Fork; 8-Shifter Rod; 10-Clevis; 12-Switch Rod; 23, 24, and 25-Oilers; 26-Oil Plug.

Gray and Davis Motor

Gray & Davis starting motor with reduction gearing for open flywheel. 1-Motor Pinion; 2-Intermediate…

Section of the Kammerbuhl, showing the probable former outline of the volcano and old volcanic plug.

Kammerbuhl

Section of the Kammerbuhl, showing the probable former outline of the volcano and old volcanic plug.

A man walking down the road covering his ear with his hands.

Man walking

A man walking down the road covering his ear with his hands.

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark

Spark Plug

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the…

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark

Spark Plug

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the…

Part of a hydraulic engine. "A device for separating sand and other heavy particles from running water. F. cast-iron body; B. cover; A. finely perforated diaphragm; D. induction-port for water; E, valve. (Water enters through D, and the sand is collected in C.) G. plug for clearing out sand." —Whitney, 1889

Sand Trap

Part of a hydraulic engine. "A device for separating sand and other heavy particles from running water.…

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…

A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed fuels such as, aerosol gasoline, Ethanol, and Liquefied petroleum gas by means of an electric spark.

Automotive Sparkplug

A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines…

A usually cylindrical piece of material used as a bottle stopper

Bottle Stopper

A usually cylindrical piece of material used as a bottle stopper