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A fitted device which lets you know when there is a gas leak in the house, meaning you should get out straight away just in case.

Gas Alarm

A fitted device which lets you know when there is a gas leak in the house, meaning you should get out…

Device for transferring water up from a lower body.

Archimedean Screw

Device for transferring water up from a lower body.

"The most accurate method of determining the specific gravity of a mineral is by the use of a chemical balance. To one beam of the balance is suspended a wire basket which is so arranged that it can be immersed in a beaker of water. The basket is hung in the water and then counterbalanced by weights on the opposite pan of the balance. The mineral specimen to be tested, having been first weighed on the balance in the ordinary fashion, is now placed in the basket under the water and weighed again." — Ford, 1912

Chemical balance

"The most accurate method of determining the specific gravity of a mineral is by the use of a chemical…

An optical device, such as a pair of field glasses or opera glasses, designed for simultaneous use by both eyes and consisting of two small telescopes joined with a single focusing device.

Double Telescope Binocular

An optical device, such as a pair of field glasses or opera glasses, designed for simultaneous use by…

A farm implement used to break up the surface of the soil for aeration and weed control and conservation of moisture

Agricultural Cultivator

A farm implement used to break up the surface of the soil for aeration and weed control and conservation…

This illustration depicts a flue damper used to serve as the valve mechanism which restricts home smoke access.

Flue Damper

This illustration depicts a flue damper used to serve as the valve mechanism which restricts home smoke…

This device makes the installation of decorative film an ease, featuring static clinging for porous surfaces, high UV ray protection

Device for Applying Decorative Films

This device makes the installation of decorative film an ease, featuring static clinging for porous…

A fertilizer distributor is an agricultural implement used to easily fertilize large quantities of soil.

Fertilizer Distributor

A fertilizer distributor is an agricultural implement used to easily fertilize large quantities of soil.

A high powered pneumatic or electrically driven device for boring holes into rock.

Rock Drill

A high powered pneumatic or electrically driven device for boring holes into rock.

An electrical instrument consisting of two plates, which can produce a spark.

Electrophotus

An electrical instrument consisting of two plates, which can produce a spark.

Apparatus for showing the presence of electricity without giving quantitative measurements.

Electroscope

Apparatus for showing the presence of electricity without giving quantitative measurements.

Motor that converts thermal energy to mechanical work

Explosive Engine

Motor that converts thermal energy to mechanical work

A machine that converts energy into mechanical force or motion.

Gas Engine

A machine that converts energy into mechanical force or motion.

A machine that converts energy into mechanical force or motion.

Internal Combustion Engine

A machine that converts energy into mechanical force or motion.

"The steam engine is a powerful device for utilizing the energy involved in the elasticity and expansive force of steam as a motive power. It is a real heat-engine, transforming heat into mechanical energy." — Avery, 1895

Steam engine

"The steam engine is a powerful device for utilizing the energy involved in the elasticity and expansive…

"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…

optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision

Mounting Eyeglass

optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision

Any of various devices consisting essentially of a series of radiating vanes or blades attached to and revolving with a central hublike portion to produce a current of air: ceiling fan; wall fan.

Vane Fan

Any of various devices consisting essentially of a series of radiating vanes or blades attached to and…

"Friction-cones. a and b, cones; c, fork. In machinery, a form of friction-coupling consisting of two cones, one of which is fitted into the other and communicates its motion to it by means of the friction between the two surfaces." -Whitney, 1911

Friction Cones

"Friction-cones. a and b, cones; c, fork. In machinery, a form of friction-coupling consisting of two…

"Astatic galvanometer, an instrument which consists of a pair of similar needles magnetized, with their poles turned opposite ways, and stiffly connected at their centers, so that both will swing together." -Whitney, 1911

Astatic Galvanometer

"Astatic galvanometer, an instrument which consists of a pair of similar needles magnetized, with their…

"A device for preventing the escape of gas through the vent or around the breech-mechanism which closes the rear end of the bore or chamber of any breech-loading small-arm, machine-gun, or cannon. Freire Gas-check. AA, breech-block; BB, expanding bolt and bolt-head; CC, expanding steel ring or gas-check; S, spiral spring; D, check-nut and set-screw." -Whitney, 1911

Freire Gas Check

"A device for preventing the escape of gas through the vent or around the breech-mechanism which closes…

Used to convert water into steam from heat produced in a nuclear reactor core. They are used in pressurized water reactors between the primary and secondary coolant loops.

Steam Generator

Used to convert water into steam from heat produced in a nuclear reactor core. They are used in pressurized…

A machine that separates the seeds, seed hulls, and other small objects from the fibers of cotton.

Cotton Gin

A machine that separates the seeds, seed hulls, and other small objects from the fibers of cotton.

Used in combination with the vehicle fender to protect vehicle passengers, other vehicles, and pedestrians from mud and other flying debris thrown into the air by the rotating tire.

Mud Guard

Used in combination with the vehicle fender to protect vehicle passengers, other vehicles, and pedestrians…

This is a hammer drill, also known as a rotary hammer, a pneumatically powered mechanism which uses percussion to penetrate rock.

Device for Hammer Drill

This is a hammer drill, also known as a rotary hammer, a pneumatically powered mechanism which uses…

Device which radiates heat, ideally used to raise temperature by means of electrical power.

Electric Heater

Device which radiates heat, ideally used to raise temperature by means of electrical power.

Device that heats water or supplies warmth to a room

Radiator Combined Heater

Device that heats water or supplies warmth to a room

Device used to heat the water in an aquarium. Heaters vary in size and style including drop-in types and submersible sump types. They feature an adjustable thermostat to maintain the water at a constant temperature.

Tank Heater

Device used to heat the water in an aquarium. Heaters vary in size and style including drop-in types…

A heater and storage tank to supply heated water

Water Heater

A heater and storage tank to supply heated water

A device for projecting sound waves, as in a loudspeaker.

Loud Horn

A device for projecting sound waves, as in a loudspeaker.

To properly place the hitch, position your harnessed horse with room on either side. Bring your carriage up from behind pulling it by the shafts. Attach trace to the carriage, threading them between girth and belly band. Tighten girth , and take the reins without letting go and climb on.

Horse Hitching Device

To properly place the hitch, position your harnessed horse with room on either side. Bring your carriage…

A notched and grooved, usually metal implement that is turned to open or close a lock.

Adjustable Key

A notched and grooved, usually metal implement that is turned to open or close a lock.

Le Pot-Casse, an engraving by Geoffroy Tory.

Le Pot-Casse

Le Pot-Casse, an engraving by Geoffroy Tory.

Any loom that uses a shuttle. Most looms use a shuttle of some sort, however there are some shuttle-less looms.

Shuttle Loom

Any loom that uses a shuttle. Most looms use a shuttle of some sort, however there are some shuttle-less…

Machine consisting of a suction apparatus for milking cows mechanically

Milking Machine

Machine consisting of a suction apparatus for milking cows mechanically

Machine used to form specialized parts by cutting (milling) material from a solid block of metal.

Milling Machine

Machine used to form specialized parts by cutting (milling) material from a solid block of metal.

Machines cut material off moving strips, usually metal, but also leather or laminates, to leave a desired edge shape or cross section.

Skiving Machine

Machines cut material off moving strips, usually metal, but also leather or laminates, to leave a desired…

A machine that inserts staples into sheets of paper in order to fasten them together

Stapling Machine

A machine that inserts staples into sheets of paper in order to fasten them together

Vending machine provides snacks, beverages, lottery tickets, and other products to consumers without a cashier. Items sold via these machines vary by country and region.

Vending Machine

Vending machine provides snacks, beverages, lottery tickets, and other products to consumers without…

A type of magnet whose magnetic field is produced by the flow of electric current. The magnetic field disappears when the current ceases.

Electro Magnet

A type of magnet whose magnetic field is produced by the flow of electric current. The magnetic field…

A trommel is a screened cylinder used to separate materials by size, separating the biodegradable fraction of mixed municipal waste or separating different sizes of crushed stone.

Mining Machine

A trommel is a screened cylinder used to separate materials by size, separating the biodegradable fraction…

A mirror intended to be held in the hand

Hand Mirror

A mirror intended to be held in the hand

A machine with a large revolving drum in which cement is mixed with other materials to make concrete

Concrete Mixer

A machine with a large revolving drum in which cement is mixed with other materials to make concrete

Machine in which rotating records cause a stylus to vibrate and the vibrations are amplified acoustically or electronically

Record Phonograph

Machine in which rotating records cause a stylus to vibrate and the vibrations are amplified acoustically…

A device used for demonstrating the elastic properties of materials.

Physics demonstration

A device used for demonstrating the elastic properties of materials.

For removing a hinge pin, a tool having a wedge-shaped head mounted on a shank equipped with a support projection to receive the hinge. The head includes an impact surface for hammering the wedge portion between the hinge and the head of the hinge pin. A striker plate perpendicular to the tool shank receives impact blows to dislodge the pin from the hinge.

Pin Removal Tool

For removing a hinge pin, a tool having a wedge-shaped head mounted on a shank equipped with a support…

Press in which a force applied by a piston to a small area is transmitted through water to another piston having a large area

Hydraulic Press

Press in which a force applied by a piston to a small area is transmitted through water to another piston…

A machine used to print paper media.

Printing Press

A machine used to print paper media.

"A press or stamp bearing dies on its jaws, or a die and a bed, for imprinting or embossing any device upon paper or a plastic material, as lead. It is much used to form the seals of seal-locks, and may be a kind of heavy pincers. a and a1, dies; b (dotted outline), bar sliding in guide c; d (dotted outline), abutment for coiled spring e; f, lever with cam g at the bottom. The lever moved in the direction in dicated by the arrow forces a down upon a1; when it is released the spring reverses the motion." —Whitney, 1889

Seal Press

"A press or stamp bearing dies on its jaws, or a die and a bed, for imprinting or embossing any device…

A machine using an electric motor to rotate thin, rigid vanes in order to move air, as for cooling.

Fan Propeller

A machine using an electric motor to rotate thin, rigid vanes in order to move air, as for cooling.

Sometimes built into a compass, this instrument allows you to determine and measure angles in degrees and is most useful when projecting magnetic lines across your map.

Bevel Protractor

Sometimes built into a compass, this instrument allows you to determine and measure angles in degrees…

A semicircular instrument for measuring and constructing angles.

Drafting Protractor

A semicircular instrument for measuring and constructing angles.

A simple device to make holding towels easy.

Towel Roller

A simple device to make holding towels easy.

A restraint provided when the brake linings are moved hydraulically against the brake drum to retard the wheel's rotation

Brake Shoe

A restraint provided when the brake linings are moved hydraulically against the brake drum to retard…

A mechanical device used to cut paper into chad, typically either strips or fine particles.

Paper Shredder

A mechanical device used to cut paper into chad, typically either strips or fine particles.

Optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision

Early Design Spectacles

Optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision

A diagram of Hartmann Spectrocomparator device to measure accurate the star's displacement. The photographed star is clamped on to the device. Then the series of light is reflected onto the photograph into the eyepiece to measuring the star's motion.

Hartmann Spectrocomparator Diagram

A diagram of Hartmann Spectrocomparator device to measure accurate the star's displacement. The photographed…

A Hartmann Spectrocomparator device to measure accurate displacement of the star by measuring the relative star motion to the observer. The object is first photographed, then the image is attached to the device measuring the distance.

Hartmann Spectrocomparator

A Hartmann Spectrocomparator device to measure accurate displacement of the star by measuring the relative…

A simple piston pump consisting of a plunger that fits tightly in a tube. The plunger can be pulled and pushed along inside a cylindrical tube (the barrel), allowing the syringe to take in and expel a liquid or gas through an orifice at the open end of the tube.

Early Model Syringe

A simple piston pump consisting of a plunger that fits tightly in a tube. The plunger can be pulled…

A grasping device consisting of two arms that are joined, often at one end, as by a pivot or a scissorlike hinge.

Tool Tong

A grasping device consisting of two arms that are joined, often at one end, as by a pivot or a scissorlike…