An illustration of a boy with a fishing pole and a tackle bag.

Boy with Fishing Gear

An illustration of a boy with a fishing pole and a tackle bag.

Waterwheel.

Breast-Wheel

Waterwheel.

A pulley with a convex rim, much used where various cases belts are in danger of slipping off.

Crown Pulley

A pulley with a convex rim, much used where various cases belts are in danger of slipping off.

"Inside View of Shield, showing Enarme, or Gear. Enarmer, provide, as a shield, with straps." -Whitney, 1911

Enarme

"Inside View of Shield, showing Enarme, or Gear. Enarmer, provide, as a shield, with straps." -Whitney,…

"Epicycloidal teeth, teeth for gearing cut in the form of an epicycloid." -Whitney, 1911

Epicycloidal Teeth

"Epicycloidal teeth, teeth for gearing cut in the form of an epicycloid." -Whitney, 1911

A wheel or ring fixed to a framework, toothed on its inner side, and having in gear with it another toothed wheel of half the diameter of the first, fitted so as to revolve around the center of the latter.

Epicycloidal Wheel

A wheel or ring fixed to a framework, toothed on its inner side, and having in gear with it another…

"Epicycloidal wheel, a wheel or ring fixed to a framework, toothed on its inner side, and having in gear with it another toothed wheel, of half the diameter of the first, fitted so as to revolve about the center of the latter. It is used for converting circular into alternate motion, or alternate into circular." -Whitney, 1911

Epicycloidal Wheel

"Epicycloidal wheel, a wheel or ring fixed to a framework, toothed on its inner side, and having in…

A piece in clocks and watches that converts rotational motion into oscillation, as in a pendulum.

Deadbeat Escapement

A piece in clocks and watches that converts rotational motion into oscillation, as in a pendulum.

"Waltham Lever Escapement. A device for the governing of speed is the one thing on which accurate time measuring depends." -Hill, 1921

Lever Escapement

"Waltham Lever Escapement. A device for the governing of speed is the one thing on which accurate time…

A piece in clocks and watches that converts rotational motion into oscillation, as in a pendulum.

Recoiling Escapement

A piece in clocks and watches that converts rotational motion into oscillation, as in a pendulum.

A pulley with a sheave having its perimeter a rectangular or nearly rectangular groove. Used for transmitting power by ropes or bands.

Flat Rope Pulley

A pulley with a sheave having its perimeter a rectangular or nearly rectangular groove. Used for transmitting…

This is a primitive clothes holder that fits around either male or female torso. The primary purpose of clothing is functional, as a protection from the elements. Clothes also enhance safety during hazardous activities such as hiking and cooking, by providing a barrier between the skin and the environment.

Garment Supporter

This is a primitive clothes holder that fits around either male or female torso. The primary purpose…

"For sprockets of different diameters, small rings D are used, of different diameters. The nut C is screwed on and off by a wrench; it has grooves, in order to get rid of the turnings that fall on the threads of the studs." —Grimshaw, 1902

Bicycle Sprockets Gear

"For sprockets of different diameters, small rings D are used, of different diameters. The nut C is…

Mechanism that connects the coupler to the frame of the car. In model railroading, the coupler mounting box is often so-named.

Draft Gear

Mechanism that connects the coupler to the frame of the car. In model railroading, the coupler mounting…

The driving gear is a machine component consisting of a toothed wheel attached to a rotating shaft. Gears operate in pairs to transmit and modify rotary motion and torque (turning force) without slip, the teeth of one gear engaging the teeth on a mating gear. If the teeth on a pair of mating gears are arranged on circles, i.e., if the gears are toothed wheels, the ratios of the rotary speeds and torques of the shafts are constant.

Driving Gear

The driving gear is a machine component consisting of a toothed wheel attached to a rotating shaft.…

"It is found preferable, therefore, when a great difference of velocity is required, to use a combination of wheels, of moderate size. In the following figure, three wheels are seen thusly connected." — Goodrich, 1844

Gears

"It is found preferable, therefore, when a great difference of velocity is required, to use a combination…

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…

Helical gearing is a modification of ordinary toothed gearing in which the pitch surfaces may be cylinders or cones (as in spur or bevel gearing); but the teeth intersect the pitch surfaces in helical lines. These wheels work much more smoothly and provide more resilience than ordinary gearing.

Helical Gearing

Helical gearing is a modification of ordinary toothed gearing in which the pitch surfaces may be cylinders…

These pulleys are grooved such as to guide the inner belt, in this system there is less of a chance that a belt will run out of the pulley.

Grooved Pulleys

These pulleys are grooved such as to guide the inner belt, in this system there is less of a chance…

"The Savart wheel consists of a heavy metal toothed wheel that may be put in rapid revolution by pulling a cord wound upon its axis. Set such a wheel in rapid motion and hold the edge of a card against its teeth. As the speed of the wheel diminishes, the shrill tone produced by the rapid vibrations of the card correspondingly falls in pitch." — Avery, 1895

Savart wheel

"The Savart wheel consists of a heavy metal toothed wheel that may be put in rapid revolution by pulling…

Shaft carrying switch-contact and gear-shifting.

Shaft

Shaft carrying switch-contact and gear-shifting.

Spaulding was a baseball enthusiast from Chicago and invented many safety precautions for baseball players.

Al Spaulding

Spaulding was a baseball enthusiast from Chicago and invented many safety precautions for baseball players.

A sprocket and chain.

Sprocket

A sprocket and chain.

A sprocket and chain.

Sprocket

A sprocket and chain.

A sprocket and chain.

Sprocket

A sprocket and chain.

A sprocket and chain.

Sprocket

A sprocket and chain.

"A wheel having teeth projecting radially from the circumference." — Williams, 1889

Spur-wheel

"A wheel having teeth projecting radially from the circumference." — Williams, 1889

"The valve gear for operating the steam hammer is shown separately, the cylinder and valve chest being in section."—Finley, 1917

Valve gear of a steam hammer

"The valve gear for operating the steam hammer is shown separately, the cylinder and valve chest being…

Gear used in fishing.

Fishing Tackle

Gear used in fishing.

A cast iron hub with teeth inserted spirally attached to a mandrel to create a gear.

Sectional Milling Cutters with Inserted Teeth Tool

A cast iron hub with teeth inserted spirally attached to a mandrel to create a gear.

"The wheel and axle consists of a wheel united to a cylinder in such a way that they may turn together on a common axis. It is a modified lever of the first or second class." — Avery, 1895

Wheel and axle

"The wheel and axle consists of a wheel united to a cylinder in such a way that they may turn together…

A wheel having teeth or cogs, used in ransmitting motion by enguaging the cogs of another similiar wheel or a rack.

Cog Wheel

A wheel having teeth or cogs, used in ransmitting motion by enguaging the cogs of another similiar wheel…

A wheel having recesses into which cogs or another wheel may be inserted, or into which cogs may be driven.

Core Wheel

A wheel having recesses into which cogs or another wheel may be inserted, or into which cogs may be…

A wheel having cogs or teeth set at right angles with its plane. Commonly used in watches.

Crown Wheel

A wheel having cogs or teeth set at right angles with its plane. Commonly used in watches.

"A lady's bicycle with gear-case and dress-guard. The rear frame of the "diamond" type is subjected to very small stresses due to vertical load. The front fork and steering post are subject to bending moment due to the reaction from the ground." — The Encyclopedia Britannica, 1910

Womans Bike

"A lady's bicycle with gear-case and dress-guard. The rear frame of the "diamond" type is subjected…