1851 Great Exhibition: Official Catalogue: Class VIII.: J. T. Chapman
From Graces Guide
121. CHAPMAN, J. T., 328 Wapping — Inventor and Patentee.
Brass models of patent shroud blocks, for setting up ships' rigging, and raising weights, as a substitute for the wooden dead-eye now in use. One man can raise, with a pair of these blocks, a weight of three tons. A patent portable screw winch, for setting up ships' rigging, and for hoisting iu cargo or raising great weights on shore.
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