US Patent 137,061 · 25 Mar 1873

Spherical burglar-proof safe

by William Corliss, Providence

Patent drawing of a spherical safe in cross-section, showing a thick round shell made in two threaded halves, a round door and the screws and gearing that pull the door into its seat
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William Corliss of Providence, Burglar-Proof Safes, US patent 137,061 of 25 March 1873, sheet 1 (detail). Public domain, US National Archives via Wikimedia Commons.

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