The earliest locks are found on Egyptian tombs, and
the Greeks and Romans made locks with bolts, keys and wards. Merchants and
travellers used padlocks to protect their belongings in unfamiliar or hostile
territories. Combination locks were invented to eliminate the need for keys –
all the owner needed to do was to remember the password or combination to open
the lock, and he did not need to worry about the key being stolen.
This is a Victorian combination
lock, with five wheels, each having 6 letters, giving a total of 7,776 possible
permutations. As the wheels are rotated, a slot in each one aligns with an
internal bar, and when the correct combination is lined up, the central barrel
can be removed, opening the lock. Antique locks of this sort are quite collectable.
Quite when combination locks were
invented is not known, but they must have been used by the early 1600s, as the
lines in Beaumont and Fletcher’s play A Noble Gentleman, from about
1613, have :-
A cap-case for your linen and
your plate,
With a strange lock that opens
with A.M.E.N. (Act V).
In 1622, Thomas Carew wrote some
verses to prefix Thomas May’s 1620 play The Heir, which include the
lines : -
As doth a lock, That goes with
letters;
For, till every one be known
The lock's as fast, as if you
had found none.
Perhaps the most famous example of a combination lock in modern times is the cryptex featured in Dan Brown’s 2003 book The Da Vinci Code. Supposedly invented by Leonardo, the cryptex is a cylinder that can only be opened by aligning the lettered wheels to the correct password. As an additional security device, the cryptex contains a glass vial of vinegar that will shatter, destroying the parchment inside, if an attempt is made to force open the cryptex. ‘Cryptex’ is a neologism, coined by Brown, combining elements from ‘cryptology’ and ‘codex’.
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