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Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures consisting of triangles, squares, and parallelograms are used to construct the given shape. This tangram depicts a boat.

Boat

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

Outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. 7 figures consisting of triangles, squares, and parallelograms are used to construct the given shapes.

Boats Outline Tangram Card

Outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented by the Chinese,…

Solutions for outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. 7 figures consisting of triangles, squares, and parallelograms are used to construct the given shapes.

Boats Outline Solution Tangram Card

Solutions for outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented…

Silhouette outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. 7 figures consisting of triangles, squares, and parallelograms are used to construct the given shapes.

Boats Silhouette Tangram Card

Silhouette outlines of boats (sailboat, ship, yacht) made from tangram pieces. Tangrams, invented by…

"A narrow flat-bottomed fishing-boat having an outrigger, much used in Annam" (Vietnam). -Whitney, 1911

Annam

"A narrow flat-bottomed fishing-boat having an outrigger, much used in Annam" (Vietnam). -Whitney, 1911

An illustration of a large wind powered ship.

Ship

An illustration of a large wind powered ship.

An illustration of children swimming in a pond near a man rowing a boat.

Children Swimming

An illustration of children swimming in a pond near a man rowing a boat.

An illustration of a rowboat.

Rowboat

An illustration of a rowboat.

"The falling weights EE turned a paddle-wheel stirrer inside the cylindrical vessel G, which was filled with water and was much like the common ice-cream freezer. The friction of the stirrer heated the water; and when distance was measured through which the weights fell, it was possible to calculate the relation between the work done by the falling weights and the heat developed in the water." Louis Derr, 1911

Thermodynamics Apparatus Showing the Relationship between the First and Second Principals

"The falling weights EE turned a paddle-wheel stirrer inside the cylindrical vessel G, which was filled…

The rotifers or wheel-animalcules are relatively small and beautiful organisms, rarely ever longer that a third of an inch. The rotifers make up a phylum of microscopic and near-microscopic pseudocoelomate animals. At first sight they they might be mistaken for one-celled animals, but the presence of a digestive tract and of reproductive elements soon dispels such a belief.

Rotifers

The rotifers or wheel-animalcules are relatively small and beautiful organisms, rarely ever longer that…

An illustration of Spanish and English ships with sails at war.

Spanish & English Ships with Sails at War

An illustration of Spanish and English ships with sails at war.

"GIN-BLOCK. A simple form of tackle-block with a single wheel, over which a rope runs. It has a hook by which it swings from the jib of a crane or the sheer of a gin." -Whitney, 1911

Gin-Block

"GIN-BLOCK. A simple form of tackle-block with a single wheel, over which a rope runs. It has a hook…

"Grapnel. A boat's anchor having from three to six flukes placed at equal distances about the end of the shank. Also grapline." -Whitney, 1911

Grapnel

"Grapnel. A boat's anchor having from three to six flukes placed at equal distances about the end of…

This sign is used to indicate that a trail or road designed for 4 wheeled vehicles is located nearby.

Trail/Road, Black and White

This sign is used to indicate that a trail or road designed for 4 wheeled vehicles is located nearby.

This sign is used to indicate that a trail or road designed for 4 wheeled vehicles is located nearby.

Trail/Road, Color

This sign is used to indicate that a trail or road designed for 4 wheeled vehicles is located nearby.

This sign is used to indicate that a trail or road designed for 4 wheeled vehicles is located nearby.

Trail/Road, Outline

This sign is used to indicate that a trail or road designed for 4 wheeled vehicles is located nearby.

This sign is used to indicate that a trail or road designed for 4 wheeled vehicles is located nearby.

Trail/Road, Silhouette

This sign is used to indicate that a trail or road designed for 4 wheeled vehicles is located nearby.

This sign is used to indicate that a ferry is located nearby.

Ferry, Black and White

This sign is used to indicate that a ferry is located nearby.

This sign is used to indicate that a ferry is located nearby.

Ferry, Color

This sign is used to indicate that a ferry is located nearby.

This sign is used to indicate that a ferry is located nearby.

Ferry, Outline

This sign is used to indicate that a ferry is located nearby.

This sign is used to indicate that a ferry is located nearby.

Ferry, Silhouette

This sign is used to indicate that a ferry is located nearby.

This sign indicates that boat tours are offered nearby.

Boat Tours, Black and White

This sign indicates that boat tours are offered nearby.

This sign indicates that boat tours are offered nearby.

Boat Tours, Color

This sign indicates that boat tours are offered nearby.

This sign indicates that boat tours are offered nearby.

Boat Tours, Outline

This sign indicates that boat tours are offered nearby.

This sign indicates that boat tours are offered nearby.

Boat Tours, Silhouette

This sign indicates that boat tours are offered nearby.

This sign indicates that a launch ramp is located nearby.

Launch Ramp, Black and White

This sign indicates that a launch ramp is located nearby.

This sign indicates that a launch ramp is located nearby.

Launch Ramp, Color

This sign indicates that a launch ramp is located nearby.

This sign indicates that a launch ramp is located nearby.

Launch Ramp, Outline

This sign indicates that a launch ramp is located nearby.

This sign indicates that a launch ramp is located nearby.

Launch Ramp, Silhouette

This sign indicates that a launch ramp is located nearby.

"Field-gun Carriage. A, stock. B, cheek. a, lunette; b, trail-plate; c, c, pointing-rings; d, handle; e, e, prolonge-hooks; f, wheel-guard plate; g, lock-chain bolt, nut, and washer; h, turn buckle, chain, and hasp for sponge and rammer; i, stop for rammer-head; k, ear-plate for worm; l, elevating-screw; m, under-strap; n, implement-hook; o, D-ring for hand-spike; q, trunnion-plate; r, cap-square; s, s, cap-square chains and keys; 1, prolonge; 2, sponge and rammer; 3, hand-spike." -Whitney, 1911

Field Gun Carriage

"Field-gun Carriage. A, stock. B, cheek. a, lunette; b, trail-plate; c, c, pointing-rings; d, handle;…

"Gyroscope. Gyroscopic top, an instrument consisting of a heavy fly-wheel revolving about an axis one point of which is fixed, but which is otherwise free to move in any way." -Whitney, 1911

Gyroscope

"Gyroscope. Gyroscopic top, an instrument consisting of a heavy fly-wheel revolving about an axis one…

"Foucault's Gyroscope. GYROSCOPE. An instrument consisting of a fly-wheel, the axis of which can turn freely in any direction, designed to illustrate the dynamics of rotating bodies." -Whitney, 1911

Foucault's Gyroscope

"Foucault's Gyroscope. GYROSCOPE. An instrument consisting of a fly-wheel, the axis of which can turn…

"Gyrostat. An instrument for illustrating the dynamics of rotation, composed of a box or case having a sharp bearing-edge in the form of a regular polygon, and containing a fly-wheel having its center and its direction of rotation in the plane of the bearing-edge." -Whitney, 1911

Gyrostat

"Gyrostat. An instrument for illustrating the dynamics of rotation, composed of a box or case having…

This gravy boat is made in the shape of a nautilus shell set on a piece of rock.

Gravy Boat

This gravy boat is made in the shape of a nautilus shell set on a piece of rock.

Color flag of India. Three equal horizontal bands of saffron (subdued orange) (top), white, and green, with a blue chakra (24-spoked wheel) centered in the white band; similar to the flag of Niger, which has a small orange disk centered in the white band.

Flag of India, 2009

Color flag of India. Three equal horizontal bands of saffron (subdued orange) (top), white, and green,…

Black and white outline flag of India. Three equal horizontal bands of saffron (subdued orange) (top), white, and green, with a blue chakra (24-spoked wheel) centered in the white band; similar to the flag of Niger, which has a small orange disk centered in the white band

Flag of India, 2009

Black and white outline flag of India. Three equal horizontal bands of saffron (subdued orange) (top),…

Color flag of Niger. Three equal horizontal bands of orange (top), white, and green with a small orange disk (representing the sun) centered in the white band; similar to the flag of India, which has a blue spoked wheel centered in the white band.

Flag of Niger, 2009

Color flag of Niger. Three equal horizontal bands of orange (top), white, and green with a small orange…

Black and white outline flag of Niger. Three equal horizontal bands of orange (top), white, and green with a small orange disk (representing the sun) centered in the white band; similar to the flag of India, which has a blue spoked wheel centered in the white band

Flag of Niger, 2009

Black and white outline flag of Niger. Three equal horizontal bands of orange (top), white, and green…

A man ships Remington rifles by boat, handing them off to a man on a bridge.

Shipping Remington Rifles

A man ships Remington rifles by boat, handing them off to a man on a bridge.

This medieval elevator shows the use of two simple machines: wheel and axle on the right, and a pulley on the left. "An elevator of the Middle Ages. History tells us this form of elevator was used in monasteries for hoisting passengers and supplies." -Hill, 1921

Early Elevator

This medieval elevator shows the use of two simple machines: wheel and axle on the right, and a pulley…

"Longitudinal section of hopper dredger, employed on the River Clyde. The vessel steams to place of working and is moored by the Steam Winches A A at bow and stern to buoys, the Bucket Ladder B is then lowered by steam power, and thereafter Buckets set in motion by gearing C C. The depth of water at which the Bucket Ladder dredges is regulated by the Hoisting Shears and Chain Barrel D D, driven by shafting E E from the Engines. The Buckets discharge the material by the shoot F into the Hopper G. The dredged material is discharged by the doors of the Hopper being opened by the Lifting Chains H H. These doors are hinged on to the side of Vessel, and suspended at centre by the Lifting Chains, which are connected to geared Crab Winches I I." -Hill, 1921

Hopper Dredger

"Longitudinal section of hopper dredger, employed on the River Clyde. The vessel steams to place of…

"Sectional view of diving bell and barge, employed on the River Clyde. All the appliances are worked by steam, rendering manual labour unnecessary. A is the Bell, which is raised and lowered by means of the Chain and Steam Winch B. c c are Seats within the Bell; d d, Footboards. E, Air-pipe entering the Bell at f, the air being supplied by Air-pump G driven by the Engine H. J is a Steam Crane for raising or lowering material. K K, Steam Winches for working moorings and shifting position of the barge." -Hill, 1921

Barge with Diving Bell

"Sectional view of diving bell and barge, employed on the River Clyde. All the appliances are worked…

"In June of 1817 President Monroe took a very extensive journey through the States, visiting all the fortifications ... He was conveyed up the Delaware from Wilminton to the navy-yard in Philadelphia in a barge of the Franklin. The barge was lined and trimmed with crimson velvet, and rowed by sixteen oarsmen, dressed in scarlet vests, white sleeves and trousers." -Abbot, 1902

Monroe's Barge

"In June of 1817 President Monroe took a very extensive journey through the States, visiting all the…

"Crankcase with crank-shaft and fly-wheel added. The crankshaft serves the same purpose in an automobile as the pedals do on a bicycle. The fly-wheel on the end helps it to keep turning at an even speed." -Bodmer, 1917

Building an Automobile, Step 02: Crank-Shaft and Fly-Wheel

"Crankcase with crank-shaft and fly-wheel added. The crankshaft serves the same purpose in an automobile…

"An electric motor starts the engine by turning the fly-wheel. This makes it unnecessary to get out and crank the car by hand." -Bodmer, 1917

Building an Automobile, Step 11: Motor

"An electric motor starts the engine by turning the fly-wheel. This makes it unnecessary to get out…

An illustration of a group of adults and children standing in front of a wind powered ship.

Group Standing in Front of Ship

An illustration of a group of adults and children standing in front of a wind powered ship.

"Capsicum, a genus of annual, sub-shrubby plants, with a wheel-shaped corolla, projecting and converging stamens, and a many-seeded berry." -Vaughan, 1906

Capsicum

"Capsicum, a genus of annual, sub-shrubby plants, with a wheel-shaped corolla, projecting and converging…

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted on a wooden handle, used for cutting wallpaper quickly and cleanly around moldings or door casings.

Paperhanger's Wheel Knife

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted…

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted on a wooden handle used, for cutting wallpaper quickly and cleanly around moldings or door casings.

Paperhanger's Wheel Knife

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted…

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted on a wooden handle, used for cutting wallpaper quickly and cleanly around moldings or door casings.

Paperhanger's Wheel Knife

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted…

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted on a wooden handle, used for cutting wallpaper quickly and cleanly around moldings or door casings.

Paperhanger's Wheel Knife

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted…

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted on a wooden handle, used for cutting wallpaper quickly and cleanly around moldings or door casings.

Paperhanger's Wheel Knife

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted…

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted on a wooden handle, used for cutting wallpaper quickly and cleanly around moldings or door casings.

Paperhanger's Wheel Knife

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted…

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted on a wooden handle, used for cutting wallpaper quickly and cleanly around moldings or door casings.

Paperhanger's Wheel Knife

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted…

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted on a wooden handle, used for cutting wallpaper quickly and cleanly around moldings or door casings.

Paperhanger's Wheel Knife

The paperhanger's wheel knife is also referred to as the casing wheel. It is a circular cutter mounted…

This paperhanger's wheel knife is a very handy tool. It is a combination of a casing knife and a corner knife. It is used for rapidly trimming surplus wallpaper from around moldings.

Paperhanger's Wheel Knife

This paperhanger's wheel knife is a very handy tool. It is a combination of a casing knife and a corner…

An illustration of a mast with a spencer-mast attachment.

Mast with Spencer-Mast Attachment

An illustration of a mast with a spencer-mast attachment.

"Drawing showing completed 50-foot diameter sand or tailings wheel." -Meese, 1913

Tailings Wheel

"Drawing showing completed 50-foot diameter sand or tailings wheel." -Meese, 1913

The Boat-billed Flycatcher, Megarynchus pitangua, is a passerine bird. It is a large tyrant flycatcher, the only member, monotypic, of the genus Megarynchus. It breeds in open woodland with some tall trees from Mexico south to Bolivia and Argentina, and on Trinidad. The nest, built by the female, is an open saucer of sticks. The typical clutch is two or three whitish eggs heavily blotched with brown. These are incubated mostly by the female for 17-18 days with a further 24 days to fledging.

Boat-billed Flycatcher

The Boat-billed Flycatcher, Megarynchus pitangua, is a passerine bird. It is a large tyrant flycatcher,…

An illustration of a deck hand falling down and spilling a pot.

Deck Hand Falling Down

An illustration of a deck hand falling down and spilling a pot.