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A reducing lever for large engines to measure pressure of steam in the cylinder. The string to the indicator is pulled as the piston compresses the steam. Similarly, the string is pulled as the steam is expanded.

Reducing Lever for Piston and Indicator in Large Steam Engines

A reducing lever for large engines to measure pressure of steam in the cylinder. The string to the indicator…

"This occurs in horizontal engines when the valve is set on top of the cylinder instead of on one side. By means of the rocker AG the valve may receive its proper motion." —Derr, 1911

Steam Engine Valve with Lap Connected to Rocker

"This occurs in horizontal engines when the valve is set on top of the cylinder instead of on one side.…

"This valve consists of two pistons connected by a sleeve through which the valve rod passes. This valve rod is prolonged to a small balancing piston, placed directly over the main valve." —Derr, 1911

Cross Sectional View of the High Pressure Cylinder of Piston Valve from USS Massachusetts

"This valve consists of two pistons connected by a sleeve through which the valve rod passes. This valve…

An illustration of a gravestone with a man and woman carved on it. They are both facing each other and kneeling in front of an altar praying.

Man and Woman on a Gravestone

An illustration of a gravestone with a man and woman carved on it. They are both facing each other and…

An illustration of a group of people surrounding a man talking to a young boy in front of a building.

Man and Boy Talking

An illustration of a group of people surrounding a man talking to a young boy in front of a building.

An illustration of Carpenter's Hall in Philadelphia, where the First Continental Congress assembled.

Outside View of Carpenter's Hall

An illustration of Carpenter's Hall in Philadelphia, where the First Continental Congress assembled.

"When set full gear forward, the valve admits steam to the crank end of the cylinder, and the crank revolves as shown by the arrow. As the crank turns, both eccentrics impart motion to the link, but the "go ahead" link pin H approximately coincides with the link block." —Derr, 1911

Eccentric Motion of the Steam Engine Crank in Full Gear

"When set full gear forward, the valve admits steam to the crank end of the cylinder, and the crank…

"All fly—wheel governors operate by shifting the eccentric either to change the angular advance, the travel of the valve, or both. The principle of a governor arranged to give decreasing lead under the head of governors." —Derr, 1911

Top View of the Fly Wheel Governor Turning Clockwise

"All fly—wheel governors operate by shifting the eccentric either to change the angular advance,…

"The main valve controls admission, release, and compression; the other (valve) regulates the cut—off only, which may be changed without in any way affecting the other events of the stroke. This cut—off valve may be placed in a separate valve chest, or it may be placed in the back of the main valve." —Derr, 1911

Close up View of Double Sliding Valve Gears from Steam Engine

"The main valve controls admission, release, and compression; the other (valve) regulates the cut—off…

"An eccentric on the main shaft gives an oscillating motion to a circular disc called the wrist plate, pivoted at the center of the cylinder. It transmits motion to each of the four valves through adjustable links known as steam rods or exhaust rods, according to whether they move the admission or exhaust valves." —Derr, 1911

Steam Engine with Reynolds Corliss Gear

"An eccentric on the main shaft gives an oscillating motion to a circular disc called the wrist plate,…

"The steam arm is keyed to the valve spindle which passes loosely through a bracket on which the bell—crank lever turns, and the spindle is packed to make a steam—tight joint where it enters the cylinder. Motion of the steam rod toward the right will turn the bell—crank lever and raise the hook stud." —Derr, 1911

Close up of Reynolds Corliss Gear from Steam Engine

"The steam arm is keyed to the valve spindle which passes loosely through a bracket on which the bell—crank…

A cylinder of wood, plastic, cardboard, or other material on which wire, thread, or string is wound.

Rack Spool

A cylinder of wood, plastic, cardboard, or other material on which wire, thread, or string is wound.

A garment for the upper part of the body, typically having a collar, sleeves, and a front opening.

Garment Shirt

A garment for the upper part of the body, typically having a collar, sleeves, and a front opening.

"A view of Wilson's invention is shown; a, b, and c, are vance which are attached to and rotate with the drum D, while d, e, and f are stationary guide vanes. Steam enters at the left, passes through the turbine longitudinally, and exhausts at the right." —Derr, 1911

Wilson's Compound Steam Turbine

"A view of Wilson's invention is shown; a, b, and c, are vance which are attached to and rotate with…

"The accumulator may consist of a large tank in which are numerous plates over which water can flow, or may contain simply water rapidly circulated by artificial means. As the exhaust steam from the engine enters this accumulator, it spreads out over the exposed water surface, and some of it is condensed if there is an excess of pressure due to more steam being supplied by the exhaust than is being utilized by the turbine." —Derr, 1911

Interior View of Rateau Accumulator

"The accumulator may consist of a large tank in which are numerous plates over which water can flow,…

A cross sectional view of Rateau electric generator turbine by Western Electric Company. Steam is used to turn the turbine to generate electricity. The turbine rotates at 1500 revolutions per minute and operates at 1500 horsepower.

Cross Section View of Rateau Turbine Electric Generator by Western Electric Company

A cross sectional view of Rateau electric generator turbine by Western Electric Company. Steam is used…

"The shaft, where it passes through the diaphragm, is fitted to a bronze bushing with a few thousandths of an inch clearance. This bushing seats on the metal surface of the diaphragm with latitude for slight side motion. It is kept to its seat by the steam pressure, but can move sideways to accommodate any whipping motion of the shaft." —Derr, 1911

Sectional View of Kerr Turbine

"The shaft, where it passes through the diaphragm, is fitted to a bronze bushing with a few thousandths…

"The marine turbine of this type (Curtis turbine) installed in the U.S. Cruiser Salem had seven pressure stages with four velocity steps in the first stage, and three in each of the others. Steam passes from the steam chest through the nozzles, each of which may be closed by a valve operated from the governor. The number open at any one time depends upon the load." —Derr, 1911

Cross Sectional View of U.S.S Salem Steam Engine Showing Curtis Turbines

"The marine turbine of this type (Curtis turbine) installed in the U.S. Cruiser Salem had seven pressure…

"The upper bearing with dowel—pins and key fit into corresponding dowel holes and key—way in the bottom of the shaft, and rotate with it. When the oil is supplied to the bearing, under a high pressure, it fills the central circular space between the blocks and forces them slightly apart. The oil then escapes between the annular edges of these two blocks and is collected into a drain and returned to the original supply." —Derr, 1911

Cross Sectional View of Curtis Turbine Step Bearing

"The upper bearing with dowel—pins and key fit into corresponding dowel holes and key—way…

A cross sectional view of a four stage vertical Riedler—Stumpf turbine. The steam enters and exit, indicated by the arrows. The steam spins a series of turbines located in the middle at a high pressure. As the turbine spins, the shaft, located in the middle, produces useable energy.

Cross Sectional View of Four Stage Vertical Riedler Stumpf Turbine

A cross sectional view of a four stage vertical Riedler—Stumpf turbine. The steam enters and exit,…

A two stage condensing Terry turbine from a steam engine. The steam, entering from the top, rotates the two turbines in the casing to generate electricity.

Cross Sectional View of Two Stage Condensing Terry Steam Engine Turbine

A two stage condensing Terry turbine from a steam engine. The steam, entering from the top, rotates…

"Steam enters at E and gradually expands in volume until it exhausts at G. The rotor is usually built in three different diameters to facilitate mechanical construction and to avoid excessively small and excessively large vanes. It is thus possible to use a large number of vanes of the same size." —Derr, 1911

Cross Sectional View of Parsons Turbine

"Steam enters at E and gradually expands in volume until it exhausts at G. The rotor is usually built…

A cross sectional view of Westinghouse Parsons turbine. Steam enters at V and exits at E, turning the turbines, R. The turbines turns the shaft, B, to produce energy to produce electricity. During this process, the steam, at high pressure, is expanded to a lower pressure.

Westinghouse Parsons Turbine Viewed Cross Sectionally

A cross sectional view of Westinghouse Parsons turbine. Steam enters at V and exits at E, turning the…

"In the Curtis turbine, steam is admitted through a series of valves, the number of which depends upon the capacity of the machine. The valves are arranged to open successively, two—thirds of them being open at full load. The action of the valves is so regulated that they are either fully open or fully closed. Any increasing load is taken care of by the opening of an additional valve, this valve closing when the load falls off." —Derr, 1911

Sectional View of Governor for Varying Number of Nozzles Opened

"In the Curtis turbine, steam is admitted through a series of valves, the number of which depends upon…

A percussion instrument consisting of a hollow cylinder or hemisphere with a membrane stretched tightly over one or both ends, played by beating with the hands or sticks.

Drum Support

A percussion instrument consisting of a hollow cylinder or hemisphere with a membrane stretched tightly…

Skull of langur monkey viewed at the side and bottom view. The eyes of the monkey is surrounded by bone and located at the front of the skull. The lower jaw moves vertically.

Lateral and Lower Views of Langur Monkey Skull

Skull of langur monkey viewed at the side and bottom view. The eyes of the monkey is surrounded by bone…

A side view of the howler monkey skull. The monkey have four sharp canines, long teeth on skull, on top and bottom of the jaw.

Side View of Howler Monkey

A side view of the howler monkey skull. The monkey have four sharp canines, long teeth on skull, on…

"In the other forms the number (vertebrae) varies between twenty and thirty three, the latter being spider monkeys. The proportion in the spider monkeys of the genus Ateles, almost three to one; in the other longest—tailed genera it is rarely so large as two to one." —Encyclopaedia Britannica, 1910

Side View of Skeleton of South American Spider Monkey

"In the other forms the number (vertebrae) varies between twenty and thirty three, the latter being…

"The greatest absolute length of the fore—limb occurs in the gorilla and the orangutan. The humerus never has a perforation on the inner side of its lower extremity. Except in the man—like apes, the ulna articulates with the wrist (carpus). The hand is capable of pronation and supination on the fore—arm; and except in man, the chimpanzee and the gorilla there is a centrale in the carpus." —Encyclopaedia Britannica, 1910

Front View of Gorilla Skeleton

"The greatest absolute length of the fore—limb occurs in the gorilla and the orangutan. The humerus…

Camera in which you view the scene through the same lens that takes the picture.

Picture Machine

Camera in which you view the scene through the same lens that takes the picture.

To take a general or comprehensive view of or appraise, as a situation, area of study, etc.

Instrumentation for Survey

To take a general or comprehensive view of or appraise, as a situation, area of study, etc.

A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed fuels such as, aerosol gasoline, Ethanol, and Liquefied petroleum gas by means of an electric spark.

Automotive Sparkplug

A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines…

An illustration of the Louvre Museum in Paris, France from a bird's-eye view. The Louvre is one of the the world's largest museums and is the most visited museum in the world.

Bird's Eye View of the Louvre

An illustration of the Louvre Museum in Paris, France from a bird's-eye view. The Louvre is one of the…

External-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder

Steam Engine

External-combustion engine in which heat is used to raise steam which either turns a turbine or forces…

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark

Spark Plug

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the…

A tube near the waterline of a vessel through which a torpedo is fired

Torpedo Tube

A tube near the waterline of a vessel through which a torpedo is fired

A vertical surface on which information can be displayed to public view

Display Board

A vertical surface on which information can be displayed to public view

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark

Spark Plug

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the…

A profile view of Queen Tai, the wife of Amenophis III, pharaoh of Egypt.

Queen Tai

A profile view of Queen Tai, the wife of Amenophis III, pharaoh of Egypt.

"The royal seal or signet used by the Chaldean and Assyrian kings was in the form of a small cylinder, having figures and characters engraved in the surface. This cylinder when rolled upon wax or other plastic substance left the king's name and emblems set in relief upon the material used in sealing."

The Seal of Ilgi

"The royal seal or signet used by the Chaldean and Assyrian kings was in the form of a small cylinder,…

"Finally should be mentioned Jerusalem, capital of Palestine. It is situated fifteen miles west of the head of the Dead Sea. It is built on a high plateau of limestone about two miles square, abutting against the mountains on the north."—Ridpath, 1885

View of Jerusalem

"Finally should be mentioned Jerusalem, capital of Palestine. It is situated fifteen miles west of the…

Side view of a steam apparatus constructed by Stephen Hoyt's Sons, New Canaan, Conn.

Steam Apparatus

Side view of a steam apparatus constructed by Stephen Hoyt's Sons, New Canaan, Conn.

Near view of couplings and details of steam spraying apparatus used in Prospect Park, Brooklyn, N.Y.

Prospect Park Steam Spraying Machine

Near view of couplings and details of steam spraying apparatus used in Prospect Park, Brooklyn, N.Y.

"The Rose-comb White and Rose-comb Brown Leghorns have a small rose comb, square in front, firm and even upon the head, tapering evenly from front to rear, without inclining to one side, the top comparatively flat and covered with small points or corrugations, terminating in a well-developed spike in the rear."—Government Printing Office, 1897

Rose-Combed White Leghorn Cockerel

"The Rose-comb White and Rose-comb Brown Leghorns have a small rose comb, square in front, firm and…

An expanded view of a blossom of pea. V-Vexillum; al-Alae, with Carina in between.

Blossom of Pea

An expanded view of a blossom of pea. V-Vexillum; al-Alae, with Carina in between.

Also known as Doryphora decemlineata. An enlarged view of the potato beetle.

Enlarged Potato Beetle

Also known as Doryphora decemlineata. An enlarged view of the potato beetle.

"This picture was drawn by a British engineer at the time of the battle. The view is from Copp's Hill, in Boston, looking north. A British battery on Copp's Hill fired across the water and set the town on fire. The smoke of the battle is seen on the hill behind the town. The wind was south-west, and carried the smoke eastward over the Mystic River."—Coffin, 1879

Burning of Charlestown

"This picture was drawn by a British engineer at the time of the battle. The view is from Copp's Hill,…

"This picture was drawn by a British engineer a few days after the battle. The view is from the north side of the hill, looking south from the spot occupied by the New Hampshire troops, under Colonel Stark and Colonel Reed. Portions of the rail-fence are to be seen. The Connecticut troops, under Colonel Knowlton, occupied the ground between the three in the centre of the view and the fort. The ground between the tree and the fort, and toward the left of the picture, was thickly strewed with the killed and wounded British soldiers. The Americans retreated past the trees at the right of the picture."—Coffin, 1879

Bunker Hill After the Battle

"This picture was drawn by a British engineer a few days after the battle. The view is from the north…

A view of New York in 1776.

New York in 1776

A view of New York in 1776.

"The view is taken from the American intrenchments on Butt's Hill. he windmill is on Quaker Hill. The hill at the right is Anthony's. The British artillery fired from both hills. Sullivan replied from the ditch in the foreground. The battle was down by the third fence, at the left hand of the view. A small brook winds along near the fence, and in the ravine was a belt of woods, where Greene posted his men."—Coffin, 1879

Butt's Hill, Looking South

"The view is taken from the American intrenchments on Butt's Hill. he windmill is on Quaker Hill. The…

"The view shows the intrenchments in the foreground. The Americans retreated past the houses in the center of the picture."—Coffin, 1879

View Looking North from Butt's Hill

"The view shows the intrenchments in the foreground. The Americans retreated past the houses in the…

"The workmen all their master will obey, / They plane and saw, and dare not stop to play; / Each boy and man the master keeps in view, / His eye does more than both his hands can do."—barber, 1857

The Eye of the Master Does More Work than Both His Hands

"The workmen all their master will obey, / They plane and saw, and dare not stop to play; / Each boy…

A view of New Amsterdam, a Dutch colony in America. It later became New York City.

New Amsterdam in 1655

A view of New Amsterdam, a Dutch colony in America. It later became New York City.

"The Guild Hall of the Cloth Merchants (begun 1201, completed 1304), was the chief edifice of the sort in Belgium and one of the finest examples of secular Gothic architecture in Europe. The façade measured 460 feet and had two ranges of painted windows. At each end rose a turret and in the middle the massive belfry. The view shows the condition of the building in August, 1915. It is now a shapeless ruin."—Webster, 1920

Guild Hall, Ypres

"The Guild Hall of the Cloth Merchants (begun 1201, completed 1304), was the chief edifice of the sort…

In the story of Balin and Balan, the image depicts the damsel removing her mantle in front of King Arthur and his followers.

The Damsel Let Fall Her Mantle

In the story of Balin and Balan, the image depicts the damsel removing her mantle in front of King Arthur…

A palace in Paris, France.

View of Versailles

A palace in Paris, France.

An early view of the University of Virginia.

University of Virginia

An early view of the University of Virginia.

"A six-sided cylinder of terra-cotta found at Ninevah. It contains a record of eight years of Sennacherib's reign, including an account of his expedition against Hezekiah, king of Jerusalem."—Webster, 1913

The Cylinder of Sennacherib

"A six-sided cylinder of terra-cotta found at Ninevah. It contains a record of eight years of Sennacherib's…

A fragment of an Ancient Egyptian text, which provided the key to the modern understanding of Egyptian hieroglyphics.

The Rosetta Stone, Front View

A fragment of an Ancient Egyptian text, which provided the key to the modern understanding of Egyptian…

A heraldic helmet made to project in the front.

Heraldic Helmet

A heraldic helmet made to project in the front.