1851 Great Exhibition: Official Catalogue: Class X.: Aubert and Klaftenberger
52A. AUBERT and KLAFTENBERGER, 157 Regent Street — Manufacturers.
Regulator remontoir, and of continual power. The movement consists of two barrels, centre, third, fourth, and escapement wheels: the axis of the fourth wheel traverses the upper plate, and receives a wheel which is fixed on the axis of the pinion above, the object of which is to wind up the weight of the maintaining power; this movement maintains the oscillation of the half-second pendulum.
The escapement wheel, and the second wheel exposed in the dial, form part of the independent train, which has to maintain the oscillation of the mercurial pendulum.
The principal and medial trains are brought into communication by means of the third wheel, seen in the dial: this wheel is fixed in the centre of a rack mounted on an axle, which is pivoted between the frame; a wheel here forms a depth into the rack, and upon the axle on which this wheel is placed, is fixed a double pulley, on one side of which is suspended a small weight, and on the other the half-second pendulum. The weight and pendulum draw contrary ways, and as the weight is heavier, it gives the power to the independent train.
The third wheel of the principal train, which forms the depth with the medial wheel seen in the dial, will displace it from right to left; by which means, if the two wheels, having the same number of teeth, turn equally quick, the intermedial wheel will be set in motion, but its axle will not change in position, and consequently the rack, and also the wheel in which the rack works, will be immoveable, and the hand fixed to the axle of the pulley will point to zero.
The independent train receiving thus a force constante, and maintaining the oscillation of the mercurial pendulum, will not be susceptible of variation. Any difference of quickness in the action of the second wheel upon the medial wheel in the dial, can only be occasioned by the principal train, through the action of the half-second pendulum, which, if not perfectly regulated, will occasion an advance or retarde.
If the half-second pendulum should advance, the principal train will raise the weight of the force constante, and the half-second pendulum acting in a contrary sense, will cause it again to fall, and consequently the pendulum will then retarde. If, on the contrary, the half-second pendulum loses, the principal train will not raise the weight of the force constante sufficiently quick, and the pendulum will then drop; but the regulator acting in a contrary manner will again shorten it, which will then cause it to advance.
Two-day marine chronometer.
Repeating watch, in gold case, striking the ours , quarters, and half-quarters; with lever escapement and compensation balance, showing, on the dial plate, the age of the moon, the day of the month, the hours, minutes, and seconds.
Pocket chronometer, in gold case, with enamel dial. Duplex and lever watches in gold cases.