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Сообщение от mrayg
C чего бы это?
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Resonance clocks have two or more pendulums locked to each other in rate, which aids rate stability and can compensate for disturbances. For this to happen, two identical pendulums that swing in the same plane must be very closely regulated to the same rate and then suspended from the same non-rigid mounting frame. Once they are set running, the two pendulums will influence each other and will start to oscillate in sympathy of the the other, trading energy until they swing in anti-phase. Once locked into anti-phase, each pendulum will correct errors in the other, should they occur. To fine-regulate the clock when running, small weights can be added to or removed from weight trays on either pendulum.
On 19 September 1825, A.-L. Breguet delivered this remarkable resonance clock to George IV for £1,000. Also delivered with the clock was a pen-and-wash drawing of the clock. In essence, the clock consists of twin movements, each complete with its own dial and pinwheel escapement, driven by a single 8-pound weight, the ends of whose line are fixed one to each barrel. The pendulums are suspended one behind the other, and each pendulum swings in the opposite direction to the other ensuring by sympathetic action that both movements remain extremely accurate. The left dial has the hour display in the window, with minutes and seconds on separate dials. The right dial has a conventional time display, plus a minute hand for apparent solar time and the date on the equation-of-time cam arbor The second hand on the right dial runs anti-clockwise.
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