Munro No. 6

constant force regulator with Charpentier escapement

The No. 7 features a French polished mahogany vitrine which lifts half off for ease in settings and adjustments. The clock can be wound without opening the case through a hinged aperture in the glass. The base and backboard are of white marble for stability. The silvered dials are matte finish with a small sunken subsidiary time dial and a recessed visible escapement. The knurled leveling feet and other visible brass elements are gilded.

How the Escapement works

There are dual ‘scape wheels, one for locking and one for rewinding the gravity arm. The locking verge is in the form of a dead beat verge without impulse faces, and unequal drops. This shares an arbor with the crutch. On alternate ticks, the long drop lifts the gravity arm, where the lifting friction avoids the need for a crutch. The next tick moves the wheel pair only a small distance, freeing the gravity arm to fall to the bottom of the lifting tooth, impulsing the pendulum by pressing additional weight to the locking crutch.

Below right: The train layout varies from traditional plated construction by having only the barrel and eight day wheels pivoted in the back plate, which doubles as the mounting plate. Upper train wheels are secured by bridges, and the front plate is cut away for wheel recesses. It has unusually massive plates for a small clock.

Features of the No. 7

-Half seconds pendulum, with flat bar grid iron temperature compensation.

-An unusually small mainspring powers the clock for eight days.

-Jeweled bearings used at all the power transmitting arbors.

-Endstones are used in all pivots not holding hands.

-Horizontal crutch prevents knife edge suspension alignment problems.

-Extended arm pendulum reduces pendulum amplitude to a minimum.







The Arcadian Clock

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