Dimensions: 205 x 30 x 22 cm ( H x B x T )
Duration: 4 months
Price Range (inkl. VAT): 55 – 65.000,00 €
The precision pendulum clock GRAMAT is the only clock currently being produced that operates in a partial vacuum similarly to the clocks in evacuated tanks produced in the last century. After a long development period, PW has succeeded in producing hand-made, extremely delicate and airtight housings. By means of a patented process, the density of the enclosed air is kept remarkably constant, thus protecting the pendulum from atmospheric changes. The sensor is a glass ball with a volume of approx. one liter. The air’s density affects the ball’s buoyancy, which, in turn, controls a small vacuum pump located in the base of the clock. This control mechanism is so sensitive that it is triggered by density changes of less than 0.1 mg per liter, which corresponds to a change in air pressure of 1/10 hPa. The control panel is located in a drawer. When it is time to wind up the clock, the vacuum control unit is turned off and air is permitted to enter through a valve. The air pressure is indicated on a precise diaphragm pressure gauge.