Periscope Reveals the Interior of a Locked Bank Vault (Nov, 1929)
Periscope Reveals the Interior of a Locked Bank Vault
THE “Tresoroskop,” a periscope-like device that has just been perfected in Germany is shown in demonstration above. It is especially designed for use in safe deposit vaults, and installed therein will be invisible to occupants of the vaults. It will also be useful to watchmen outside of the walls, who can look through it from the outside and inspect the vault without entering or unlocking the doors.