Wilkes detector lock

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This lock was made by John Wilkes about 1680

It was used on the door of a room where valuables were kept

It has special security features

The lock can be secured quickly by simply cocking the hat

It is unlocked by turning the knob as the hat is pushed down

The soldiers leg conceals the keyhole

The key activates both of the bolts

A further turn fully shoots the main bolt

It is called a detector lock because it counts each time it is unlocked

This told the owner if the door had been opened in his absence

When the dial reaches 100, the main bolt can be locked but not released

A tiny button allows the dial to be reset

Modernised the inscription reads

If I had the gift of tongue, I would declare and do no wrong

Who you are that come by stealth, to impair my Masters wealth