A high-grade astronomical regulator made in Austria circa 1920. This very clock was in The Time Museum collection, inventory no. 3883. 221111

This eight-day regulator movement is very good quality. The brass plates are heavily constructed and are substantial. Four substantial screw-fixed pillars or posts support the plates. The movement features a dead-beat escapement with adjustable jeweled pallets, jeweled pivot holes for the pallet holes, and pallet arbors. The gearing is light and designed with five crossings, and the pinion count is high. Additional features include Harrison’s maintaining power, a grooved winding drum, and an offset crutch with a counterweight acting upon an adjustable impulse piece attached to the top of the pendulum. This movement winds through a hole in the hour hand. It is powered by a cylindrical-shaped weight that hangs from a pulley that features five crossings. The minute hand shaft is fitted with a counterweight that is positioned behind the dial. The second hand is also counterweighted, having a tail. All three hands are steel and have been treated with a blued finish. The pendulum is very unusual and quite interesting. It features a quartz rod. This is round along its length. The rod features a roller suspension. It supports a double cylindrical nickel-plated bob. The bob is engraved, Made in Austria. A fine adjustment tray is fixed to the rod above the bob. Both the pendulum and movement are supported by a massive brass bracket mounted to the backboard. The movement is held in place with two large thumbscrews that thread into the bottom of the plates.

The brass dial is mounted to the movement with four screws. It is brass engraved in an astronomical format, with individual dials for the seconds, minutes, and hour displays. The outer dial is the minute dial. It is divided into sixty blocks. Arabic style numerals mark out the five-minute positions. This encloses the hour and seconds dial. The second dial is demarked at each ten-second position with Arabic-style numerals. The five-minute positions not recorded are marked with dashes. The hour dial is divided by 12. Each hour uses Roman-style numerals to mark its position. All of the engravings are finished in black. The surface of the dial is treated with a silver wash for contrast. The perimeter of the dial is fitted with a bevel-edged molding.

The rectangular-shaped case is constructed in mahogany and features beveled glass panels on three sides. Through these, one can view the pendulum and weight. The front opens as a door. Please note the interior bead on the door that fits into a channel in the case sides. This is a method of dust-proofing the inside of the case. The hood door can be secured with a locking mechanism. Inside the case at each corner are four large brass wall levelers. A swing indicator is also located inside the case that is used to mark the amplitude of the pendulum’s swing arch.

This clock was made circa 1920. This case measures approximately 54 inches in height. The case is 14 inches wide and 10.25 inches deep at the base molding.

This regulator was sold by Sotheby’s on December 2, 1999, in New York. It is pictured as lot number 57 in the catalog entitled, Masterpieces from the Time Museum Including Watches, Clocks, and Scientific Instruments.

221111

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