1851 Great Exhibition: Official Catalogue: Class VIII.: John Spenceley
From Graces Guide
117. SPENCELEY, JOHN, Whitstable, near Canterbury — Inventor and Proprietor.
Patent pillar and screw apparatus, for preventing ships from "hogging," and for restoring hogged ships to their original shear, for taking all strain off the side fastenings, and preventing the butts from working. It can be used at sea, and the ship straightened without going into dock or laid ashore, and is applicable to steam-boats, men-of-war, and merchant vessels of all descriptions.
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