Key Guns

Imagine that you're a jailer in the Nineteenth Century. You have to open an occupied cell, perhaps to transfer a prisoner or deliver a meal. To open the cell, you need your hands free. But that would leave you unarmed. The solution is a key gun: a gadget that opens the cell while the jailer remains armed. You can view five more examples at the link. Link -via Gizmodo | Photo: David Galbraith

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