1851 Great Exhibition: Official Catalogue: Class X.: George Cox
From Graces Guide
347. COX, GEORGE, 5 Barbican — Manufacturer.
A portable instrument for ascertaining correct time by equal altitudes of the sun, and intended for rating timepieces, watches, and chronometers.
The "periphan," an instrument for facilitating the study of astronomy and astronomical geography; intended to explain many phenomena which cannot be illustrated by a common globe.
Beam draining-level, with adjusting parallel plates on tripod stand, giving by inspection the rise and fall of laud intended to be drained; useful in laying tiles, levelling, and building operations.
The A-level for the above purposes, without parallel plates or tripod stand.
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