1851 Great Exhibition: Official Catalogue: Class X.: William Wright
121. WRIGHT, WILLIAM, Exchequer Row, Aberdeen — Designer and Manufacturer.
A clock, showing the minutes, hours, days of the month, and months of the year; the time of the sun's rising and setting; the diurnal revolution of the sun and moon; the moon's age; phases; time of her meridian passage and position relative to the sun; the time of high water at Aberdeen, both superior and inferior tides, and its depth at the bar; and the state of the tide at some of the principal sea-ports of Great Britain, Ireland, France, North and South America, Spain, Portugal, Holland, and Germany; it goes twelve months.
[By adding one or two wheels below the great wheel, and by greatly increasing the usual weight of a clock, it can be made to go for a year. Occasionally such clocks are furnished with two barrels, for the purpose of avoiding the great strain upon the teeth of one large wheel and pinion.—J. G.]