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A block used in hauling in the pursing line or bridle of a purseseine. Two of these attached o the purse-davit by hooks.

Pursing Block

A block used in hauling in the pursing line or bridle of a purseseine. Two of these attached o the purse-davit…

Children turning crank at the well.

Children turning crank

Children turning crank at the well.

"The simplest idea of a crank is that of a handle to a wheel; its action is familiarly illustrated in the process of drawing water from a well: the bent handle attached to the wheel is first pushed out, then pulled in the opposite direction, and thus a continued rotatory motion is produced upon an axle. The application of this principle to the steam engine, and the variations of pressure on the crank of a steam enginre, may be conveniently illustrated by curves." —Comstock, 1850

Crank

"The simplest idea of a crank is that of a handle to a wheel; its action is familiarly illustrated in…

"The usual form of crank-axle bearing which has inward-cups and is cup-adjusting. The end of the bracket is split and the cup after adjustment is clamped in position by the clamping screw S. The usual mode of fastening the cranks to the axle is by round cotters C with a flat surface at a slight angle to the axis, thus forming a wedge, which is driven in tight. The small end of the cotter projects through the crank, and is screwed and held in place by a nut. The chain-wheel at the crank-axis is usually detachable fastened to the right-hand crank." — The Encyclopedia Britannica, 1910

Crank-axle Bearing

"The usual form of crank-axle bearing which has inward-cups and is cup-adjusting. The end of the bracket…

A beam or rod stretching across the top of something; specifically, the bar at the end of a piston rod of a steam engine, which slides on ways or guides fixed to the bed or frame of the engine.

Crosshead

A beam or rod stretching across the top of something; specifically, the bar at the end of a piston rod…

"The threads of the screw act upon the teeth cut into the wheel. As the screw turns, each thread catches a tooth on the wheel to rotate the wheel indefinitely." —Quackenbos 1859

Endless Screw

"The threads of the screw act upon the teeth cut into the wheel. As the screw turns, each thread catches…

"A crank which regulates the motion of the chief or escapement wheel of a train of clock-work worked by the pendulum or spring." — Williams, 1889

Escapement

"A crank which regulates the motion of the chief or escapement wheel of a train of clock-work worked…

An arm attached at right angles to a rotating shaft by which reciprocating motion is imparted to or received from the shaft. It is used to change circular into reciprocating motion, or reciprocating into circular motion.

Crank Mechanism

An arm attached at right angles to a rotating shaft by which reciprocating motion is imparted to or…

"It is apparent by turning the crank, C, the wheel will revolve, for the thread of the screw passes between the cogs of the wheel. By means of an axle, through the centre of this wheel, like the common wheel and axle, this becomes an axceedingly powerful machine, but...is slow." -Comstock 1850

Screw and Wheel

"It is apparent by turning the crank, C, the wheel will revolve, for the thread of the screw passes…

"Seaming-Maching. (a), vertical shaft and support, horizontally adjustable, and carrying at the top (a) former (f); (b), (a) counterpart former working at right angles with (f) on the support (c); (d), screw with crank by which (b) can be set toward or away from (f); (e), crank keyed to the shaft of (b). The edge of the metal is passed under (b) and over (f) which the crank (e) is turned." -Whitney, 1911

Seaming Machine

"Seaming-Maching. (a), vertical shaft and support, horizontally adjustable, and carrying at the top…

An illustration of one of the early telephones, known as a chemical telephone. Some used a liquid transmitter, some had a metal diaphragm that induced current in an electromagnet wound around a permanent magnet, and some were "dynamic" - their diaphragm vibrated a coil of wire in the field of a permanent magnet or the coil vibrated the diaphragm.

Chemical Telephone

An illustration of one of the early telephones, known as a chemical telephone. Some used a liquid transmitter,…

The top portion of a well with a crank to retrieve the bucket.

Well Bucket

The top portion of a well with a crank to retrieve the bucket.

"Windlass.—The common windlass for drawing water is another modification of the wheel and axle. The winch, or crank, by which it is turned, is moved around by the hand, and there is no difference in the principle, whether a whole wheel is turned, or a single spoke. The winch, therefore, answers to the wheel, while the rope is taken up, and the weight raised by the axle, as already described." —Comstock, 1850

Windlass

"Windlass.—The common windlass for drawing water is another modification of the wheel and axle.…