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"Differential arc lamp mechanism." —Croft 1917

Differential Arc Lamp

"Differential arc lamp mechanism." —Croft 1917

The box or ring of metal connecting the contiguous ends of two lengths of shaft.

Coupling Box

The box or ring of metal connecting the contiguous ends of two lengths of shaft.

A kind of permanent coupling which consists of two disks keyed on the connected ends of the two shafts.

Disk Coupling

A kind of permanent coupling which consists of two disks keyed on the connected ends of the two shafts.

A kind of permanent coupling in which the boss ends of the connected shafts are made of semi&mdashcylindrical, so that they overlap each other.

Half Lap Coupling

A kind of permanent coupling in which the boss ends of the connected shafts are made of semi&mdashcylindrical,…

A form of coupling belonging to the class of friction couplings.

Slip Clutch Coupling

A form of coupling belonging to the class of friction couplings.

A kind of permanent coupling in which the coupling box is made in half and square.

Square Coupling

A kind of permanent coupling in which the coupling box is made in half and square.

A kind of permanent coupling in which the coupling box consists of a plain ring of metal, supposed to resemble a tailor's thimble.

Thimble Coupling

A kind of permanent coupling in which the coupling box consists of a plain ring of metal, supposed to…

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius of curvature of the inner face of an annular lens. The outer face is the same as that of an ordinary annular lens, which the other face, though straight in the vertical, is ground to the required curve in the horizontal plane. The rays f'fc falling upon the lens x converge to the vertical focal plane ff and afterwards diverge through the smaller horizontal angle x'f'x', and so for any other case." —The Encyclopedia Britannica, 1910

Differential Lens

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius…

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius of curvature of the inner face of an annular lens. The outer face is the same as that of an ordinary annular lens, which the other face, though straight in the vertical, is ground to the required curve in the horizontal plane. The rays f'fc falling upon the lens x converge to the vertical focal plane ff and afterwards diverge through the smaller horizontal angle x'f'x', and so for any other case." —The Encyclopedia Britannica, 1910

Differential Lens

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius…

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius of curvature of the inner face of an annular lens. The outer face is the same as that of an ordinary annular lens, which the other face, though straight in the vertical, is ground to the required curve in the horizontal plane. The rays f'fc falling upon the lens x converge to the vertical focal plane ff and afterwards diverge through the smaller horizontal angle x'f'x', and so for any other case." —The Encyclopedia Britannica, 1910

Differential Lens

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius…

"In the differential pulley, an endless chain is reeved upon a solid wheel that has two grooved rims and is carried in a fixed block above, and upon a pulley below." — Avery, 1895

Differential Pulley

"In the differential pulley, an endless chain is reeved upon a solid wheel that has two grooved rims…

A set of mechanical gears that eqaulises the power between the left and right drive wheels, particularly when cornering, when the outside wheel travels further than the inside wheel.

Gearing Differential

A set of mechanical gears that eqaulises the power between the left and right drive wheels, particularly…

"Used to compare the temperature between two environments. As the temperature in one bulb increases, the liquid reading changes according to the air expanding within the bulb. If both bulbs are the same temperature, the scale measures zero." —Quackenbos 1859

Differential Thermometer

"Used to compare the temperature between two environments. As the temperature in one bulb increases,…