This “Detector Lock” from 1680 Reveals an Intruder’s Presence

As early as the 17th century, English craftsman John Wilkes’s locks once safeguarded valuables. Today, his clever contraptions are considered to be treasures in their own right.

Museums around the world display the craftsman’s surviving works; this lock was spotted by The Verge in Amsterdam’s Rijksmuseum.

Called “the detector lock,” the complicated, two-bolt device is designed to tell someone whether anyone has opened a room without its owner’s permission.