1851 Great Exhibition: Official Catalogue: Class X.: Watkins and Hill
From Graces Guide
659. WATKINS and HILL, 5 Charing Cross — Manufacturers.
Three feet plate electrical machine, with all the recent improvements, having positive and negative conductors, on the plan suggested by Sir William Snow Harris.
Very sensitive and delicate galvanometer of the most approved form, for measuring the feeblest currents of voltaic electricity.
Electro-magnetic engine; microscopes; aerometric balance; sextants; rain-gauge; Polariscope; theodolite; levels; etc.
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