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combination lock
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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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combination lock

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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
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

A combination lock is a security device that opens using a specific sequence of numbers or letters, rather than a traditional key. This type of lock is a variation of earlier mechanical locks that secured doors or receptacles. Early locks, dating back thousands of years, used wooden bolts and keys with pegs to lift pins. The Romans introduced metal locks and wards, which are internal projections that guide the key. Modern combination locks evolved from "letter-locks" used in the 17th century. These locks feature rings with letters or numbers that must be aligned to a specific sequence to open. This design offers a high degree of security due to the vast number of possible combinations and the absence of a keyhole, making them resistant to tampering.12

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