1851 Great Exhibition: Official Catalogue: Class VIII.: Henry Mangles Denham
From Graces Guide
72. DENHAM, Captain HENRY MANGLES, R.N., F.R.S., United Service Club — Inventor. COOPER and MACLEAN, 12 Billiter Square, Agents.
Model, with a drawing and description, of the registered "jury tiller," for steering a ship when the usual helm fittings become disabled through fire abaft, the rudder-tree or head being shattered by shot or a wringing strain, the inboard tiller breaking short off, or the wheel gear breaking down suddenly in a gale or a tide-way. It consists of an auxiliary appendage to the rudder at the water-line, and can be thrown into gear in an instant.
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