1851 Great Exhibition: Official Catalogue: Class X.: Thomas Bell
679 BELL, THOMAS, 19 Homer Street.
Watches, to go for one or three years, keep correct time, and show the day of the month; some are furnished with centre and others with ordinary seconds and quarter seconds; maintaining power whilst winding; duplex and other escapement; and composition balances.
Timepieces and clocks, on the same construction.
A turret clock, to strike the hours and quarters; with best gun metal wheels and bosses, or holes; tempered and polished steel pinions of high numbers; dead-beat escapement, with adjusting palletts; tempered steel escape wheel, and tempered steel racks, snails, and hammer tails to the striking work; and improved pendulum, with adjustment of the same.
Interior hour, minute, and seconds hands, and dials for regulating and setting the hands upon clock faces, by patent metal lines instead of cords, to suspend weights.
Balanced hands, etc.