Key Chain Free Stock Images

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A key chain with a colorful frog attached. A key chain with a colorful frog attached

Lock and chain isolated on white background. Lock and chain isolated on white background

Smile piggy bank with home key chain on US dollar background. Saving for property investment concept

Smile piggy bank with home key chain on US dollar background. Saving for property investment concept

Laptop keyboard secured

Laptop keyboard secured with chain and padlock

Computer security

A lock with chain on a pc. A lock with chain on a pc

Restrained by a pocket watch chain. Restrained by a pocket watch chain

Key chain with cyan beetle car.

Key chain with cyan beetle car.

Clothing red heart key chain isolated on white

Clothing red heart key chain isolated on white

Bunch of keys with on metal chains

A gate locked with a golden yale and chain. A gate locked with a golden yale and chain

Looking into the Top of Tide Predicting Machine No. 2

These components perform key computations for Tide Predicting Machine No. 2, a special purpose mechanical analog computer for predicting the height and time of high and low tides. The tide prediction formula implemented by the machine includes the addition of a series of cosine terms. The triangular metal pieces are part of slotted yoke cranks which convert circular motion to a vertical motion that traces a sinusoid. Each slotted yoke crank is connected by a shaft to a pulley, which causes the pulley to follow the sinusoidal motion. A chain going over and under pulleys sums each of their deflections to compute the tide. Along the top of the photo, connecting shafts drive slotted yoke cranks on both sides of the machine. The U.S. government used Tide Predicting Machine No. 2 from 1910 to 1965 to predict tides for ports around the world. The machine, also known as “Old Brass Brains,” uses an intricate arrangement of gears, pulleys, chains, slides, and other mechanical components to perform the computations. A person using the machine would require 2-3 days to compute a year’s tides at one location. A person performing the same calculations by hand would require hundreds of days to perform the work. The machine is 10.8 feet (3.3 m) long, 6.2 feet (1.9 m) high, and 2.0 feet (0.61 m) wide and weighs approximately 2,500 pounds (1134 kg). The operator powers the machine with a hand crank. The National Oceanic and Atmospheric Administration (NOAA) occasionally displays the machine at its facility in Silver Spring, Maryland. These components perform key computations for Tide Predicting Machine No. 2, a special purpose mechanical analog computer for predicting the height and time of high and low tides. The tide prediction formula implemented by the machine includes the addition of a series of cosine terms. The triangular metal pieces are part of slotted yoke cranks which convert circular motion to a vertical motion that traces a sinusoid. Each slotted yoke crank is connected by a shaft to a pulley, which causes the pulley to follow the sinusoidal motion. A chain going over and under pulleys sums each of their deflections to compute the tide. Along the top of the photo, connecting shafts drive slotted yoke cranks on both sides of the machine. The U.S. government used Tide Predicting Machine No. 2 from 1910 to 1965 to predict tides for ports around the world. The machine, also known as “Old Brass Brains,” uses an intricate arrangement of gears, pulleys, chains, slides, and other mechanical components to perform the computations. A person using the machine would require 2-3 days to compute a year’s tides at one location. A person performing the same calculations by hand would require hundreds of days to perform the work. The machine is 10.8 feet (3.3 m) long, 6.2 feet (1.9 m) high, and 2.0 feet (0.61 m) wide and weighs approximately 2,500 pounds (1134 kg). The operator powers the machine with a hand crank. The National Oceanic and Atmospheric Administration (NOAA) occasionally displays the machine at its facility in Silver Spring, Maryland.

Locked rusty gate

Old rusty gate locked with a chain and padlock. Old rusty gate locked with a chain and padlock

Silhouette of a key chain with pig in dollar frame. Silhouette of a key chain with pig in dollar frame

Old pig-iron chain with new lock on the old wood door. Old pig-iron chain with new lock on the old wood door

Valentines day background with blue heart

Beautiful Valentines day background with blue key chain. Beautiful Valentines day background with blue key chain

A frozen lock and rusted chain. A frozen lock and rusted chain.

Hand holding key chain

Hand holding key chain

Security locked-key

Security locked-key on white background.

Two interlocking key chain rings isolated on the white background. Two interlocking key chain rings isolated on the white background

Portrait of woman with perfect body tied with a ch

Portrait of woman with perfect body tied with a chain. Hi key, studio shot.

A rusty padlock attached to a metal gate and chain.

Canvas key chain isolated

Canvas key chain isolated

Mechanically Adding Trigonometric Functions

These components perform key computations for Tide Predicting Machine No. 2, a special purpose mechanical analog computer for predicting the height and time of high and low tides. The tide prediction formula implemented by the machine includes the addition of a series of cosine terms. The triangular metal pieces are part of slotted yoke cranks which convert circular motion to a vertical motion that traces a sinusoid. Each slotted yoke crank is connected by a shaft to a pulley, which causes the pulley to follow the sinusoidal motion. A chain going over and under pulleys sums each of their deflections to compute the tide. The U.S. government used Tide Predicting Machine No. 2 from 1910 to 1965 to predict tides for ports around the world. The machine, also known as “Old Brass Brains,” uses an intricate arrangement of gears, pulleys, chains, slides, and other mechanical components to perform the computations. A person using the machine would require 2-3 days to compute a year’s tides at one location. A person performing the same calculations by hand would require hundreds of days to perform the work. The machine is 10.8 feet (3.3 m) long, 6.2 feet (1.9 m) high, and 2.0 feet (0.61 m) wide and weighs approximately 2,500 pounds (1134 kg). The operator powers the machine with a hand crank. These components perform key computations for Tide Predicting Machine No. 2, a special purpose mechanical analog computer for predicting the height and time of high and low tides. The tide prediction formula implemented by the machine includes the addition of a series of cosine terms. The triangular metal pieces are part of slotted yoke cranks which convert circular motion to a vertical motion that traces a sinusoid. Each slotted yoke crank is connected by a shaft to a pulley, which causes the pulley to follow the sinusoidal motion. A chain going over and under pulleys sums each of their deflections to compute the tide. The U.S. government used Tide Predicting Machine No. 2 from 1910 to 1965 to predict tides for ports around the world. The machine, also known as “Old Brass Brains,” uses an intricate arrangement of gears, pulleys, chains, slides, and other mechanical components to perform the computations. A person using the machine would require 2-3 days to compute a year’s tides at one location. A person performing the same calculations by hand would require hundreds of days to perform the work. The machine is 10.8 feet (3.3 m) long, 6.2 feet (1.9 m) high, and 2.0 feet (0.61 m) wide and weighs approximately 2,500 pounds (1134 kg). The operator powers the machine with a hand crank.

Key chain with house shaped pendant on green

Key chain with house shaped pendant on green

Toy teddy bear in a store

Key Chain of toy teddy bear in a store

Secure data - memory stick and floppy.

Photograph of a computer data stick, wrapped with silver chain and padlocked with gold padlock, lying on a floppy disk. Isolated white background. Photograph of a computer data stick, wrapped with silver chain and padlocked with gold padlock, lying on a floppy disk. Isolated white background.

Low key image of a children's swing at a playground on a gloomy fall afternoon.

Leather key holder

Leather key holder with bunch of keys, close-up

Three keys in key chain

Three keys in key chain

Hourglass tied with a chain. Hourglass tied with a chain

Chain and lock with white background. Chain and lock with white background

The old padlock and rusty chain on a metal lattice.

Protected wallet

Wallet protected by chain with paddlock. Wallet protected by chain with paddlock

old antique key with badge on white

Antique key isolated on white background. Antique key isolated on white background

Red heart on a chain as a key fob. Red heart on a chain as a key fob

Leather key chain

Leather key chain

Old key on a white background

Old key on a white background close up

Young businesswoman holding house shaped key chain

Young businesswoman holding house shaped key chain

Dummy with a ball and chain made of money. Dummy with a ball and chain made of money

Close up of a large lock and chain securing an urban building. Close up of a large lock and chain securing an urban building

Metal key chain is souvenir from singapore sign

Metal key chain is souvenir from singapore sign

Lock unlocked with key in it

Antique pocket-watch

Antique pocket-watch with chain on blue

A hand holding a heart shape key-chain acting fishing. A hand holding a heart shape key-chain acting fishing.

House shaped key chain

House shaped key chain

Key chain

Secret Information. Letters of information symbol wrapped in chain and locked.

Secret Information. Letters of information symbol wrapped in chain and locked.

Couple holding key chain house, buying property, mortgage for young family

Couple holding key chain house, buying property, mortgage for young family

Captive thought

Lock and chain around a light bulb illustration. Lock and chain around a light bulb illustration

Steel chain locked into gravel ground, hot weather

Keychain in the form of home and the key

Keychain in the form of home and the key on a white background

Antique key wth badge

Antique key with badgeisolated on white background. Antique key with badgeisolated on white background

Blank leather key chain isolated on white background with clipping path.

Blank leather key chain isolated on white background with clipping path.

Four keys on a key chain. Close-up photo.

Rusty padlocks over river

Sealed padlocks closed to heavy chain over river. Sealed padlocks closed to heavy chain over river

Blue key chain evil eye from Turkey. Blue key chain evil eye from Turkey

Small brown dog with black nose and gold collar

Small brown dog sitting with black nose and gold chain. Small brown dog sitting with black nose and gold chain

House under lock and key on white background.

Antique pocket-watch

Antique pocket-watch with chain on blue

Unlocking the data

Photograph of hand holding a key and a CD with chain and padlock. Dark background. Photograph of hand holding a key and a CD with chain and padlock. Dark background.

Antique pocket-watch

Antique pocket-watch with chain on blue

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