Lock, key and bolt, English, 18th Century, iron. The key is guided into the lock by a bar fitting into a groove at the end of the wards, which strike against two pins to move the bolt Iron lock, key and bolt, English, 18th century. 1701-1800
Two damaged capstan head brass bolts and torn part of cardboard dark slide sheet for Kew photoheliograph designed by Warren De la Rue for the Royal Society, London, in 1857 and made by Ross, London. Kew Photoheliograph 1857
