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"Arms of Alexander VI. (Borgia)" — Young, 1901

Alexander VI

"Arms of Alexander VI. (Borgia)" — Young, 1901

"Bassoon with 17 keys. Savary Model." — The Encyclopedia Britannica, 1910

Bassoon

"Bassoon with 17 keys. Savary Model." — The Encyclopedia Britannica, 1910

A cartoon of a woman holding a welcome mat in one hand, and a key in the other hand.

Cartoon of Woman Holding Welcome Mat

A cartoon of a woman holding a welcome mat in one hand, and a key in the other hand.

"A key. The key was used in very early times, and was probably introduced into Greece from Egypt; although Eustathius states, that in early times all fastenings were made by chains, and that keys were comparatively of a much later invention, which invention he attributes to the Laconians. We have no evidence respecting the materials of which the Greeks made their keys, but among te Romans the larger and coarser sort were made of iron. Those discovered at Pompeii and elsewhere are mostly of bronze. The annexed woodcut represents a key found at Pompeii, the size of which indicated that it was used as a door key." — Smith, 1873

Clavis

"A key. The key was used in very early times, and was probably introduced into Greece from Egypt; although…

An illustration of a key for a condenser.

Key for Condenser Page

An illustration of a key for a condenser.

Fox wearing a hat, jacket, and boots unlocks a door

Fox

Fox wearing a hat, jacket, and boots unlocks a door

"Arms of Innocent VIII. (Cibo)" — Young, 1901

Innocent VIII

"Arms of Innocent VIII. (Cibo)" — Young, 1901

An illustration of a key.

Key

An illustration of a key.

This key is designed in an Italian style. It has a circular top with a leaf scroll all around and an initial in the center.

Key

This key is designed in an Italian style. It has a circular top with a leaf scroll all around and an…

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.

Decorative lock and key.

Lock and Key

Decorative lock and key.

A key is an instrument that is used to operate a lock. A typical key consists of two parts like the one shown, the blade, which is the part that slides into the key way of the lock and distinguishes between different keys and the bow, which is left protruding so that torque can be applied by the user.

Multiple Purpose Key

A key is an instrument that is used to operate a lock. A typical key consists of two parts like the…

An illustration of an old fashioned key.

Old Fashioned Key

An illustration of an old fashioned key.

A piano keyboard.

Keyboard

A piano keyboard.

"Arms of Leo X (Medici)." — Young, 1901

Arms of Leo X

"Arms of Leo X (Medici)." — Young, 1901

Lock and key.

Lock

Lock and key.

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

Locker, Black and White

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

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

Locker, Color

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

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

Locker, Outline

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

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

Locker, Silhouette

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

"Arms of Martin V." — Young, 1901

Arms of Martin V

"Arms of Martin V." — Young, 1901

Telegraph key, also known as a Morse key, are generic terms for any switching device used primarily to send Morse code.

Morse Key

Telegraph key, also known as a Morse key, are generic terms for any switching device used primarily…

"Arms of Paul II (Barbo)." — Young, 1901

Paul II

"Arms of Paul II (Barbo)." — Young, 1901

"Arms of Paul III. (Farnese)" — Young, 1901

Paul III

"Arms of Paul III. (Farnese)" — Young, 1901

Princess and king find a young man with a key

Princess

Princess and king find a young man with a key

A key used by the ancient Romans for a dwelling or a chest.

Roman Key

A key used by the ancient Romans for a dwelling or a chest.

A signal book used in the United States Navy which includes a key to interpret messages.

Signal Book

A signal book used in the United States Navy which includes a key to interpret messages.

"Arms of Sixtus IV. and Julius II. (Della Rovere)" — Young, 1901

Sixtus IV

"Arms of Sixtus IV. and Julius II. (Della Rovere)" — Young, 1901

"The spinet is a keyed musical instrument much in use from 1500 to 1760. It derived its name from the spines or crowquills which, attached to levers called jacks, plucked the string and produced the tone."—Finley, 1917

Spinet

"The spinet is a keyed musical instrument much in use from 1500 to 1760. It derived its name from the…

This illustration depicts the use of a key tag, using an object to aid in the identification of a key.

Key Tag

This illustration depicts the use of a key tag, using an object to aid in the identification of a key.

"A transmitter or key is a current interrupter manipulated by the operator. It consists essentially of a metal layer, L, pivoted at aa, and conneted to the line by the screw at m which is insultated from the base, and the screw at n which is connected to the base and lever." -Avery 1895

Telegraph Transmitter

"A transmitter or key is a current interrupter manipulated by the operator. It consists essentially…

Treasury Department seal

Treasury Department seal

Treasury Department seal

"A Typewriter is a machine fitted with types which print by a pressure on the keys with the fingers. The principle, briefly stated, is that of a series of rods pivoted to keyed rods, similar to the action of a pianoforte, the ends of the rods carrying the characters of the alphabet and all striking on a common center. There is a self-inking arrangement, and several minor improvements have been added in recent years, bringing the invention to a high state of perfection. The writing machine called the typewriter was invented at Milwaukee, Wis., in 1867, by C. Latham Sholes, Samuel W. Soule, and Carlos Glidden."—(Charles Leonard-Stuart, 1911)

Typewriter

"A Typewriter is a machine fitted with types which print by a pressure on the keys with the fingers.…

"Arms of Urban VIII. (Barberini)" — Young, 1901

Urban VIII

"Arms of Urban VIII. (Barberini)" — Young, 1901