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References & Edit History Related Topics

Images

Figure 1: Ancient Egyptian lock

Figure 2: Contemporary version of the Yale lock (Left) All pins lifted to proper height by correct key, which can be turned to open lock, and (right) pins lifted to incorrect height by wrong key, lock will not open

Figure 3: Warded lock and key

Figure 4: Barron tumbler lock, 1778

Figure 5: Bramah lock, 1784

Figure 6: Combination safe lock The lock cannot be opened until the slots on the three wheels are in line; movement of the dial is transmitted to each wheel by a system of pins (in practice much shorter than shown), arms, and studs

For Students

Discover

Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

The Largest Islands in the World

The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.

What If the President Is Impeached?

Panama Canal infographic

Timeline and Map of the Panama Canal

Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England

7 of the World’s Most Dangerous Festivals

World Data Locator Map: Australia

Is Australia an Island?

Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society

The 10 Greatest Basketball Players of All Time

Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)

6 Cultures That Recognize More than Two Genders

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Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Photos

Figure 1: Ancient Egyptian lock

Figure 2: Contemporary version of the Yale lock (Left) All pins lifted to proper height by correct key, which can be turned to open lock, and (right) pins lifted to incorrect height by wrong key, lock will not open

Figure 3: Warded lock and key

Figure 4: Barron tumbler lock, 1778

Figure 5: Bramah lock, 1784

Figure 6: Combination safe lock The lock cannot be opened until the slots on the three wheels are in line; movement of the dial is transmitted to each wheel by a system of pins (in practice much shorter than shown), arms, and studs

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Topics

key Yale lock warded lock time lock tumbler pin tumbler ward padlock Newell lock Barron lock fence fire prevention and control computer security doorstop

Key People

Charles Chubb

British inventor