1851 Great Exhibition: Official Catalogue: Class X.: J. Hewitson
From Graces Guide
Presumably John Hewitson
152. HEWITSON, J., Newcastle-upon-Tyne — Inventor and Manufacturer.
Self-acting and self-registering tide gauge and tidal indicator, recording with accuracy any variation of the tide, and requiring no supervision. Time is kept by an astronomical clock, with pendulum vibrating seconds. Hours, minutes, and seconds shown on their respective circles, with the height of the tide at the moment of observation, exhibited on the opposite dial. In connection with the instrument, other machinery is applied to exhibit to an observer, on a large scale, and to be seen at a great distance, the depth of water on the bar, or over shoals, or, in short, at any given place.
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