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This illustration shows a Blake Ore Breaker (stone crusher), used in a gold stamp mill. This crusher breaks the large, mined rocks containing the gold (ore) into small pieces, to then be reduced to the finest powder by stamps.

Blake Ore Breaker

This illustration shows a Blake Ore Breaker (stone crusher), used in a gold stamp mill. This crusher…

A steam ship that aids in daily transportation.

Steam Boat

A steam ship that aids in daily transportation.

"In this water, instead of passing over, or entirely under the wheel, is delievered in the direction of its centre. This is one of the most common wheels, and is employed where there is not a sufficient fall for the construction of the overshot kind." -Comstock 1850

Breast Wheel

"In this water, instead of passing over, or entirely under the wheel, is delievered in the direction…

The high cost and low top speed of electric vehicles compared to later internal combustion vehicles caused a worldwide decline in their use.

Electric Carriage Type Vehicle

The high cost and low top speed of electric vehicles compared to later internal combustion vehicles…

"In compound levers, equilibrium is established when the power, multiplied by the first arms of all the levers, is equal to the weight multiplied by the last arms of all the levers." —Quackenbos 1859

Compound Lever

"In compound levers, equilibrium is established when the power, multiplied by the first arms of all…

"Compound pulleys using one fixed and two moveable pulleys to pull a weight up by applying a downward force." -Avery 1895

Compound Pulley

"Compound pulleys using one fixed and two moveable pulleys to pull a weight up by applying a downward…

"Compound pulley designed to use very little power to lift heavy weights." -Avery 1895

Compound Pulley

"Compound pulley designed to use very little power to lift heavy weights." -Avery 1895

"For many purposes compressed air is preferable to steam or other gas for use as a motive power. In such cases air compressors are used to compress air. These are made in many forms, but the most common one is to place a cylinder, called the air cylinder, in front of the crosshead of a steam engine, so that the piston of the air cylinder can be driven by attaching its piston rod to the crosshead in a manner similar to a steam pump." —Hallock 1905

Air Compressor

"For many purposes compressed air is preferable to steam or other gas for use as a motive power. In…

"... shows one of the commonest (sic) forms in which this kind of lever appears,-the crowbar. The power is applied at the handle. The weight is at the other end, and consists of something to be moved. The fulcrum is a stone on which the crowbar rests." —Quackenbos 1859

Crowbar

"... shows one of the commonest (sic) forms in which this kind of lever appears,-the crowbar. The power…

"Then the fire of Jehovah fell, and consumed the burnt-offering, and the wood, and the stones, and the dust, and licked up the water that was in the trench. And when all the people saw it, they fell on their faces: and they said, Jehovah, he is God; Jehovah, he is God." I Kings 18:38-39 ASV <p>Illustration of Elijah kneeling before the altar, surrounded by a trench as the people kneel and praise God. The altar has a bull on top of it and it is on fire. Flames shoot down from heaven.

Elijah Praying to God to Set Fire to His Altar in Front of the Prophets of Baal

"Then the fire of Jehovah fell, and consumed the burnt-offering, and the wood, and the stones, and the…

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the fulcrum is between the power and weight, the lever is of the first class." &mdash; Avery, 1895

First Class Lever

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the fulcrum is…

"A Lever of the First Kind is one in which the fulcrum is between the power and the weight... where F represents the fulcrum, P the power, and W the weight." &mdash;Quackenbos 1859

First Class Lever

"A Lever of the First Kind is one in which the fulcrum is between the power and the weight... where…

"George Stephenson is emphatically the engineer to whose intelligence and perseverance we owe the introduction of railroads into England, and consequently into the United States. It was at Killingworth Colliery that he constructed his first locomotive." -Lupton

George Stephenson's First Locomotive

"George Stephenson is emphatically the engineer to whose intelligence and perseverance we owe the introduction…

"[This illustration] represents a fixed pulley. The block is attached to a projecting beam. P is the power, and W the weight. For every inch that P descends, W ascends the same distance." &mdash;Quackenbos 1859

Fixed Pulley

"[This illustration] represents a fixed pulley. The block is attached to a projecting beam. P is the…

Any furnace in which the heat is provided by an electric current

Electric Furnace

Any furnace in which the heat is provided by an electric current

That part of a gas fixture where the gas is burned as it escapes from one or more minute orifices.

Gas-burner

That part of a gas fixture where the gas is burned as it escapes from one or more minute orifices.

An electric generator is a device that converts mechanical energy to electrical energy. The reverse conversion of electrical energy into mechanical energy is done by a motor; motors and generators have many similarities.

Electric Generator

An electric generator is a device that converts mechanical energy to electrical energy. The reverse…

"Porter's governor, a modification of Watt's original model."&mdash;Finley, 1917

Porter's governor

"Porter's governor, a modification of Watt's original model."—Finley, 1917

"Watt's method of regulation, which consists in varying the pressure of the steam supplied to the engine by opening or closing more or less a valve in the supply pipe."&mdash;Finley, 1917

Watt's governor

"Watt's method of regulation, which consists in varying the pressure of the steam supplied to the engine…

"Suppose the inclined plane, to be two feet from A to B, and one foot from C to B, then, as we have already seen, a power of one pound at P, would balance a weight of two pounds at W." -Comstock 1850

Inclined Plane

"Suppose the inclined plane, to be two feet from A to B, and one foot from C to B, then, as we have…

"The lever of the first class has the fulcrum between the power and the weight." Examples: a common crowbar, a pump handle, scissors, a seesaw. -Foster, 1921

First Class Lever

"The lever of the first class has the fulcrum between the power and the weight." Examples: a common…

This illustration shows the first class of lever. This class employs a fulcrum between the power and the weight.

First Class of Lever: Fulcrum Between Power and Weight

This illustration shows the first class of lever. This class employs a fulcrum between the power and…

"In straight levers of the first kind, the fulcrum is between the power and the resistance, as in fig 1, where F is the fulcrum of the lever AB; P is the power, and W the weight or resistance."&mdash;Pettigrew, 1874

First Kind of Lever

"In straight levers of the first kind, the fulcrum is between the power and the resistance, as in fig…

"The lever of the second class has the weight between the power and the fulcrum." Examples: a nutcracker, a wheelbarrow. -Foster, 1921

Second Class Lever

"The lever of the second class has the weight between the power and the fulcrum." Examples: a nutcracker,…

"In the second order of levers, the resistance is between the fulcrum and the power; and, as before, P : W :: BF : AF, but the pressure of the fulcrum is equal to W-P, or the weight less the power."&mdash;Pettigrew, 1874

Second Kind of Lever

"In the second order of levers, the resistance is between the fulcrum and the power; and, as before,…

"The lever of the third class has the power between the weight and the fulcrum." Examples: sewing machine treadle, forearm. -Foster, 1921

Third Class Lever

"The lever of the third class has the power between the weight and the fulcrum." Examples: sewing machine…

"In the third order of lever the power acts between the prop and the resistance, where also P : W :: BF : AF, and the pressure on the fulcrum is P-W, or the power less the weight."&mdash;&mdash;Pettigrew, 1874

Third Kind of Lever

"In the third order of lever the power acts between the prop and the resistance, where also P : W ::…

"A pulley is a wheel having a grooved rim for carrying a rope or other line, and turning on an axis carried in a frame, called a pulley block. The pulley is movable if the block moves during the action of the power." &mdash; Avery, 1895

Movable pulley

"A pulley is a wheel having a grooved rim for carrying a rope or other line, and turning on an axis…

"This wheel of all others, gives the greatest power with the least quantity of water, and is, therefore, generally used when circumstances will permit, or where there is a considerable fall, with a limited quantity of water." -Comstock 1850

Overshot Wheel

"This wheel of all others, gives the greatest power with the least quantity of water, and is, therefore,…

"Now when Simon saw that through the laying on of the apostles' hands the Holy Spirit was given, he offered them money, saying, Give me also this power, that on whomsoever I lay my hands, he may receive the Holy Spirit. But Peter said unto him, Thy silver perish with thee, because thou hast thought to obtain the gift of God with money." Acts 8:18-20 ASV <p>Illustration of Simon the Sorcerer offering money to Peter. The money bag and coins are falling to the ground and Peter has his hand raised. Another apostle is walking away from the scene. A large column and curtain decorate the background.

Peter Rejects the Money of Simon the Sorcerer

"Now when Simon saw that through the laying on of the apostles' hands the Holy Spirit was given, he…

This electric generator is a device that converts mechanical energy to electrical energy. The reverse conversion of electrical energy into mechanical energy is done by a motor.

Power Generator

This electric generator is a device that converts mechanical energy to electrical energy. The reverse…

"Pulleys designed to allow the weight to be pulled up while the power is applied downwards." -Avery 1895

Pulleys

"Pulleys designed to allow the weight to be pulled up while the power is applied downwards." -Avery…

"Some forms of centrifugal pump, however, have been designed for use with horse power and even for windmills."&mdash;Government Printing Office, 1897

Centrifugal Pump

"Some forms of centrifugal pump, however, have been designed for use with horse power and even for windmills."—Government…

"The power is generally applied by a wheel or a lever, and moves through the circumfrence of a circle. The distance between the two consecutive turns of any on continuous thread, measured in the direction of the axis of the screw, is called the pitch of the screw." -Avery 1895

Screw with Lever Arm

"The power is generally applied by a wheel or a lever, and moves through the circumfrence of a circle.…

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the weight is between the power and the fulcrum, the lever is of the second class." &mdash; Avery, 1895

Second Class Lever

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the weight is…

"A Lever of the Second Kind is one in which the weight is between the power and the fulcrum." &mdash;Quackenbos 1859

Second Class Lever

"A Lever of the Second Kind is one in which the weight is between the power and the fulcrum." —Quackenbos…

A cream separator is device invented by Martin Wiberg to separate cream from milk (see also Gustaf de Laval). Before milk-cream separators, cream was separated from milk by letting milk sit until the cream floated to the top and could then be skimmed off by hand. The separator was first made by Gustaf de Laval in 1877. With it, it was possible to separate the cream from the milk. When it spins, the milk, which is heaviest, is pushed outward against the walls and the cream, which is lighter, is collected in the middle.

Power Cream Separator

A cream separator is device invented by Martin Wiberg to separate cream from milk (see also Gustaf de…

"In the single moveable pulley, the same rope passes from the fixed point, A, to the power, P. It is evident here, that the weight, W, ten pounds, five pounds will be supported by one string, and five by the other. The power will then support twice its own weight." -Comstock 1850

Single Movable Pulley

"In the single moveable pulley, the same rope passes from the fixed point, A, to the power, P. It is…

"St. Peter gives to Pope Leo III the stola and to Charlemagne the banner of Rome as symbols of the spiritual and temporal power. The portrait of Charlemagne here shown is with little doubt the oldest in existence."&mdash;Myers, 1905

The Spiritual and the Temporal Power

"St. Peter gives to Pope Leo III the stola and to Charlemagne the banner of Rome as symbols of the spiritual…

"The steam engine, in its many forms, is the agent by means of which part of th eenrgy stored up in the steam, as supplied by a coiler, is converted into mechanical or useful work."&mdash;Finley, 1917

Steam engines

"The steam engine, in its many forms, is the agent by means of which part of th eenrgy stored up in…

In electronics, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another.

Electric Switch Handle

In electronics, a switch is an electrical component that can break an electrical circuit, interrupting…

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the power is between the weight and the fulcrum the lever is of the third class." &mdash; Avery, 1895

Third class lever

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the power is…

"A Lever of the Third Kind is one in which the power is between the weight and the fulcrum." &mdash;Quackenbos 1859

Third Class Lever

"A Lever of the Third Kind is one in which the power is between the weight and the fulcrum." —Quackenbos…

"Water enters through J and K following into G and H compartments. Afterwards the water is forced into the outside compartments thus turning the wheel." &mdash;Quackenbos 1859

Water Turbine

"Water enters through J and K following into G and H compartments. Afterwards the water is forced into…

"Thus constructed, this wheel moves equally well whether the water acts on one or the other side of the boards, and hence is employed for tide wheels, which turn in one direction when the tide is going out, and in the other when it is coming in." -Comstock 1850

Undershot Wheel

"Thus constructed, this wheel moves equally well whether the water acts on one or the other side of…

Illustration of the god called Woden in Germanic mythology and Odin in Norse mythology. Much like Zeus in Greek mythology, Odin is the chief god. He is pictured sitting on a raised platform, wrapped in a robe, holding a spear, Gungnir, in his hand. A thin band crowns his head. His wolves, Geri and Freki, are pictured on either side of the platform. His crows, Huginn and Muninn, are pictured, one on his shoulder and one flying nearby. His name is inscribed in runes on the front of the platform.

Woden or Odin, Germanic and Norse God, Seated with His Wolves and Crows

Illustration of the god called Woden in Germanic mythology and Odin in Norse mythology. Much like Zeus…