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CIRCA 1810
細節
A fine and rare Empire ormolu striking constant force skeleton clock simulating perpetual motion
Circa 1810
FRAME: in two tiers, the lower with four pillars with milled and lanceolate leaf cast capitals, capped by ball finials and resting on a rectangular platform above toupie feet, the upper tier with four conforming pillars on transverse-positioned sub-frame
DIAL: white enamel Roman chapter ring with ormolu bezels and star-pierced ormolu hands
GOING TRAIN: powered by ball bearings caught by externally positioned teeth on a revolving wheel and periodically (approximately one per minute) released onto a skeletonized chute, rolling down this and triggering a release of power from a spring barrel and which drives a second wheel with internally positioned teeth, into which the ball then falls; the balls from the second wheel being released when they reach its apex, onto an articulated arm which lifts one ball at a time up on to a further skeletonized chute and depositing it back on to the first wheel, and so on
ESCAPEMENT: cylinder with pivoted bar-bell
STRIKE TRAIN: powered by a line of ball bearings positioned on a skeletonized chute to the front of the clock, falling on to a small drive wheel with externally positioned teeth and released by a countwheel, with centrifugal governor, the number of balls released matching the appropriate hour or half hour (six balls at six o'clock, one ball at the half hour etc), falling down a tube and striking a bell before rolling down a further chute to a lifting mechanism, also powered by the spring barrel and taking the ball bearings up a tube and back on to the chute from which they started, with one ball rising through the tube every five minutes
14½ in. (37 cm.) high
Circa 1810
FRAME: in two tiers, the lower with four pillars with milled and lanceolate leaf cast capitals, capped by ball finials and resting on a rectangular platform above toupie feet, the upper tier with four conforming pillars on transverse-positioned sub-frame
DIAL: white enamel Roman chapter ring with ormolu bezels and star-pierced ormolu hands
GOING TRAIN: powered by ball bearings caught by externally positioned teeth on a revolving wheel and periodically (approximately one per minute) released onto a skeletonized chute, rolling down this and triggering a release of power from a spring barrel and which drives a second wheel with internally positioned teeth, into which the ball then falls; the balls from the second wheel being released when they reach its apex, onto an articulated arm which lifts one ball at a time up on to a further skeletonized chute and depositing it back on to the first wheel, and so on
ESCAPEMENT: cylinder with pivoted bar-bell
STRIKE TRAIN: powered by a line of ball bearings positioned on a skeletonized chute to the front of the clock, falling on to a small drive wheel with externally positioned teeth and released by a countwheel, with centrifugal governor, the number of balls released matching the appropriate hour or half hour (six balls at six o'clock, one ball at the half hour etc), falling down a tube and striking a bell before rolling down a further chute to a lifting mechanism, also powered by the spring barrel and taking the ball bearings up a tube and back on to the chute from which they started, with one ball rising through the tube every five minutes
14½ in. (37 cm.) high
注意事項
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