Munro No. 7

The No. 7 astronomical regulator is a radical departure from previous work. In this clock the traditional architecture of the movement has been replaced by a single block construction based on the Lepine caliper in watches. This is the first regulator utilizing the "uniblock", a single block of brass forming the front plate of the movement, which doubles as the dial plate and the bezel, with it’s edge being decoratively engine-turned.

inside view of the uniblock; train wheels are secured by bridges, and the block is cut away for wheel recesses.

Details of the escapement
The No. 7 features a split impulse (club tooth) escapement which keeps drop to a minimum. The steel 'scape wheel pictured on the left is .015" (the thickness of a business card). The verge is made of .032" spring steel set with synthetic ruby pallet stones.

matte finish sterling silver dials with sunken subsidaries and blue steel hands.

• Half seconds pendulum, with flat bar grid iron temperature compensation.
• Two pound weight driven, with a weight drop of 12.5 inches for eight days.
• White marble base and backboard for stability.
• Pull-wind mechanism to keep the case from being opened and letting dirt in on a weekly basis. The small counterweight on the left pulls the winding cord back into the case.
• Extended arm pendulum reduces pendulum amplitude to a minimum.
• Jeweled bearings used at all the power transmitting arbors.
• Endstones are used in all pivots not holding hands.
• Horizontal crutch prevents the knife edge suspension alignment problems.
  

The Arcadian Clock Co.munro@arcadianclock.com

(908) 276-0276

©2003 The Arcadian Clock Co.