1851 Great Exhibition: Official Catalogue: Class X.: John Pennington
From Graces Guide
53. PENNINGTON, JOHN, High Street, Camberwell — Inventor and Manufacturer.
Marine chronometer, with improved compensating balance weight, to remedy the defect produced in ordinary chronometers by extremes of temperature.
A A represents levers with weights attached, B B, acting on pivots, C C, held against bankings, D D, in middle temperature when not in action, by springs, E E, moved towards centre of balance in extreme heat by point of screws, F F, and the same by shoulder of screws, G G, in extreme cold.
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