They were widely used in Scotland for accessing common areas like tenement closes between the late 18th Century and the start of the 20th Century as they were cheaper and more robust than more traditional locks, since they had no moving parts and replacement keys could be simply be cast from existing ones. They were not particularly difficult to circumvent, but they provided a sufficient level of security to deter casual or opportunist thieves.
Odell's nightlatches had a complex-shaped ward inside them (top right - not from the same door) which was mirrored by the spaces in their associated key (bottom right). This allowed a key to be inserted into the base of the T-shaped hole and then be slid upwards over the ward to release the latch (not shown). If the pattern on the key didn't match the shape of the ward, this couldn't be done.
Cont./
This unusual T-shaped keyhole (left) is part of an Odell's nightlatch. It's at the entrance to an 1850s tenement on Kelvingrove Street and is only the second I've found in the wild in Glasgow.
Cont./
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: Bridge 96, Poole Footbridge
: track bridge
: https://www.openstreetmap.org/?mlat=53.0910797581769&mlon=-2.25538318046398#map=17/53.0910797581769/-2.25538318046398
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Design Constraints Bring Lockbox to Life - One of the most paradoxical aspects of creating art is the fact that constraints, ... - https://hackaday.com/2025/04/27/design-constraints-bring-lockbox-to-life/ #passivecomponents #combination #woodworking #lockbox #keypad #relay #lock #art
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