1851 Great Exhibition: Official Catalogue: Class X.: Smith and Sons, John, Lancelot and William
129. SMITH and SONS, JOHN, LANCELOT, and WILLIAM, St. John's Square, Clerkenwell - Manufacturers.
Regulator and case, with self-adjusting pendulum, suited to any temperature, by its own action; with barometer, thermometer, etc.
[Astronomical clocks are sometimes made, and yet not used in observation, but kept by clockmakers themselves, for the purpose of being used as a standard by which to adjust other clocks, chronometers, and watches not yet brought to time; and such clocks, when so used, are called regulators, from the use to which they are put; and when they have good compensating pendulums, and the best escapements, they differ from astronomical clocks only in the name.—J. G.]
Detector clock, or watchman's timepiece, for indicating the precise time of absence or neglect of duty in watchmen, nightwardens, etc.; forming also a bracket time-piece.
Eight-day office dials.
Eight-day church or turret clock.
Church clock to chime the quarters.
Skeleton timepiece and almanac, which goes twelve months with once winding, and shows seconds, minutes, and hours, with the days of the week, and the month, on one dial.
Skeleton quarter clock, which chimes the quarters on eight bells, and strikes on steel wire gong.