1851 Great Exhibition: Official Catalogue: Class X.: William Tanner
From Graces Guide
28. TANNER, WILLIAM, 83 Upper Street, Islington — Inventor.
The polyhorion (or many-hour clock) exhibits, in addition to the local time, the time at Dublin, Paris, and Edinburgh; it can be made to show the time at any other four places. This clock is simple and not liable to get out of order, as one movement and pendulum regulate the different times.
Lever watch, set to Liverpool and Greenwich time; but it can be set to the times of any two places more convenient.
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