AUCTION : 0519

Jeweler's Regulators

Stock#: 24050

DESCRIPTION: Synchronome Co. Ltd., London, a Shortt- Synchronome sidereal free pendulum master clock with slave, the master with invar pendulum rod, cylindrical bob and brass compensation sleeve, housed in a cylindrical copper vacuum tank with integral mounting brackets, evacuation valve at the base, and instrument cluster for monitoring temperature and pressure inside the tank, the top with heavy bell jar, and plate glass bottom allowing viewing of the beat scale attached to the bottom of the pendulum, heavy cast brass four legged frame suspending the pendulum and movement, the movement with damascened, lacquered brass plates and bridges, receiving electrical impulse from the slave, which in turn drops a gravity arm to periodically impulse the pendulum, the slave with rectangular mahogany case having a molded top and base, silvered astronomical dial signed "Synchronome London", the movement with "hit and miss synchronizer" having a cast backplate and lacquered brass components, pendulum rod with cylindrical bob, and beat scale mounted to a canted oak block, together with original factory nameplates, vacuum sealing grease, and fine regulation weights. Provenance Purchased as parts and assembled by G. Richman, Brooklyn, N.Y., 1972; Then to Clifford Haumiller; Purchased by the consignor at Dunning's Auction, Elgin Illinois, Collection of Clifford Haumiller, 11/1/87, lot 117.
CONDITION:Master and slave functioning at time of consignment, copper tank with tarnish, bottom glass with minor chips, movement, impulse wheel carriage and suspension block in old lacquer, four legged frame polished and in newer lacquer, front left leg with abrasion, thermometer and barometer good, beat scale and mirror good, pendulum with letter S crudely punched into bottom of bob, suspension spring replaced, and not in the Shortt style, pendulum impulse wheel with minor flat, two screws replaced and one missing in each of the pendulum safety mounts, slave case moldings with separation at joints, shrinkage has left a gap in the case top, door and left side with warp, door with gap when closed, two catches added to left side to secure door, upper lock latch plate detached but present, minor losses to finish, pendulum bob with minor abrasions, gathering wire replaced, gathering jewel made from a piece of plastic wire insulation. The Shortt free pendulum clock was the standard for precision timekeeping from the early 1920's until about 1950, when it was surpassed by the quartz oscillator. In 1926, the clock confirmed tiny seasonal changes in the rotation of the earth, and was the first timekeeper more accurate than earth itself. A Shortt clock at the U.S. Naval Observatory was studied in the mid 1980's, using modern equipment to measure it's accuracy; the clock was found to be stable to within .002 seconds per day, the equivalent of one second in twelve years. The study also confirmed that the clock was sensitive enough to detect changes in gravity due to tidal distortion of the earth caused by the gravitational pull of the sun and moon.
ESTIMATE: $90000 - $120000
CIRCA: 1928--1950
DIMENSIONS: 55.25in x 16in x 8in

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Stock#: 24067

DESCRIPTION:Clemens Riefler, Nesselwang, a rare observatory tank regulator with electric remontoire, the type A3 movement with knife edge suspension resting on polished agate pads, gravity escapement with jewelled, two arm impulse levers, movement fitted with a 60 tooth wheel on the escape arbor with jewelled switch for sending signals at one second intervals, signed, silvered astronomical dial engraved "Clemens Riefler Nesselwang No. 712 1947", blued steel hands, J1 SCH seconds beating pendulum with invar rod and cylindrical bob, serial #1071, the movement mounting frame with with microscope for reading beat scale, all contained within a copper cylinder and under a heavy glass bell jar, suspended by a heavy cast iron bracket, together with low voltage power supply, solenoid, switch board for controlling the various components related to the time recorder, and panel with vernier tape reading device accurate to within .005 seconds
CONDITION:running at time of consignment, recording equipment was not in use, and so functionality is unknown, movement dirty, would benefit from service, dial good, dial mounting holes slightly enlarged, hands good, microscope with minor marks and scratches, optics good, movement mounting frame with from bell jar sealant, pendulum with minor marks and scratches, bell jar good, tank with two small dents and some deep scratches, mounting bracket repainted, switch board and drive for recorder very dirty, reading device cover with missing hook, solenoid mounting board with split
ESTIMATE: $50000 - $80000

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Stock#: 24114

DESCRIPTION:Clemens Riefler, Nesselwang, type A3 astronomical regulator with barometric compensation and electric remontoire, glazed oak case with cast iron, rear mounted movement mounting and levelling bracket, silvered, arabic numeral astronomical dial with blued steel hands, signed "Clemens Riefler Nesselwang No. 740 1958", jewelled movement with knife edge suspension resting on polished agate pads, gravity escapement with jewelled, single arm impulse levers, and also fitted with a wheel on the escape arbor with jewelled switch for sending signals at one second intervals, J type seconds beating pendulum with barometric compensation, weight tray and six weights for fine regulation, serial #3456, and adjustable beat scale, including an additional, purpose made plexiglas dial, to allow viewing of the front plate and remontoire
CONDITION:rear side of case back with losses to veneer, case with a few minor bumps and dings, dial with minor marks and scratches, minute hand with minor abrasion, movement dirty, oily, needs service, pendulum bob with minor dents at right edge, back of bob with minor scratches and dings, pendulum rod good, barometric auxiliary good, tray with minor distortion, plexiglass dial with scratches
ESTIMATE: $40000 - $60000
CIRCA: 1958
DIMENSIONS: 61 in x 19 x 9

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Stock#: 24070

DESCRIPTION:Synchronome Co., Ltd., for Dykes Bros. Glasgow, London, a rare Shortt-Synchronome astronomical regulator with Shortt's inertia escapement, mahogany case with molded cornice and base, the glazed door with rectangular beveled glass, the upper section with round dial glass and carved spandrels, case sides with glazed rectangular apertures beneath the cornice, the signed, silvered astronomical dial with blued steel hands, four wheel movement with narrow rectangular brass plates driving the hands, case back with very heavy triangular cast iron suspension support for pendulum having two invar compensation rods connecting it to the bottom mounted movement and supporting the beat scale, the movement with snailed brass backplate and agate tipped gravity arm, the arm electrically reset every second, and interacting with a wheel mounted to a carriage at the bottom of the pendulum rod, providing impulse to the pendulum at every oscillation, the invar rod with steel suspension and cylindrical lead bob
CONDITION:case with minor dings and scratches, some door joints with minor separation, case sides with holes for wiring, door lock in place, but will not retain catch, escutcheon loose, turn catch added at bottom of door, filled hole where a similar upper catch was fitted, movement retains it's original lacquer, movement with minor oxide on steel components, pendulum retaining sleeve with screws in addition to the retaining pin, weight tray in old lacquer, bob with minor scratches, dents and dings, impulse wheel carriage with replaced unlocking jewel, the replacement made of nylon, beat scale a bit dirty. Frank Hope- Jones met William Hamilton Shortt in 1910, and soon thereafter, Shortt had analyzed the Synchronome pendulum impulse, and also became involved in improvements to the existing master clock design, thus beginning a journey which would ultimately result in the Shortt- Synchronome Free Pendum Clock. The Inertia Escapement was meant to maintain constant amplitude through changes in barometric pressure or other disturbance, delivering impulse dependent on the pendulum arc- shorter for high amplitude, and longer for low. The pendulum receives impulse on every swing, the gravity arm released when the jewel at the bottom of the impulse wheel carriage contacts the release lever, dropping the gravity arm. The arm is then electrically reset, and is ready to provide impulse at the next swing. The invar rods connecting the pendulum suspension expand and contract with the invar pendulum rod, maintaining the relationship between the release jewel (at bottom of pendulum) and the release lever (mounted to movement) . Hope- Jones presented a lecture to the British Astronomical Society in November of 1911, and one month later to the Royal Astronomical Society promoting the new regulator. Timekeeping was not much better than that of the the existing Synchronome master, and problems related to locking and unlocking of the gravity arm, as well as disturbances caused by impulsing at every swing prompted the abandonment of the design. Of the approximately twelve inertia escapement clocks believed to have been made, three are known; this example, one in the Science Museum in London, the other in a private collection.
ESTIMATE: $8000 - $12000
CIRCA: 1911
DIMENSIONS: 56.5 in x 14in x 8.5in

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Stock#: 24134

DESCRIPTION:Strasser & Rohde, Glasshutte, a hanging oak cased, B1 grade astronomical regulator, the rectilinear style 9 case with glazed doors, molded top and bottom, the right side of the upper section hinged to allow access to the movement, and back with iron mounting bracket, signed, silvered astronomical dial with blued steel hands and lacquered brass bezel, grade B1 movement with heavy, grained and lacquered brass plates, finely cut wheels and pinions, escape wheel and pallet arbor jewelling set in screwed chatons, jewelled pallets, and Harrison's maintaining power, type 13, two cylinder invar pendulum with auxiliary compensation and crutch adjustment, brass clad lacquered weight and original key, serial #607 (movement), 673 (pendulum)
CONDITION:case good, upper door with splits, inside of bottom with a few scratches and dings, dial with moderate tarnish, hands very good, movement ticking, wheelwork very dirty, plates, mounting bracket, and other brass components in old and possibly original lacquer, pendulum and weight good, key good. A nice example by this esteemed maker.
ESTIMATE: $9000 - $12000
CIRCA: 1915
DIMENSIONS: 59 in x 17in x 9in

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