Astronomical dial wall timepiece. Number 1 Regulator size.

This case form was originally called a wall timepiece or wall regulator. Today, it is often referred to as a large banjo clock. The case is constructed in mahogany wood and mahogany veneers are positioned over New England white pine. This fine example measures approximately 50 inches in length.

The dial bezel is decoratively turned out of figured mahogany. It is constructed from a single selection of wood. It is fitted with glass and hinged on the right. Its prepose is to protect the dial and hands. Open it and one gains access to adjust the finely crafted steel hands and to wind this clock.

The dial measures approximately 14 inches in diameter and is painted on iron. This dial has been professionally repainted a number of years ago. It is showing some minor signs of age. This dial displays the time in an Astronomical format. This means that three separate dials are used to display the time. The large time ring, which is located on the outer edge of this dial, displays the minutes. The minutes are indicated by the long narrow steel hand which is mounted onto the center shaft in the middle of the dial. Inside this outer ring one will find two subsidiary dials. The upper subsidiary dial displays the seconds. The lower subsidiary dial displays the hours. The unusual display of the time requires a unconventional movement setup.

The time only weight driven movement is brass construction. It is designed to run eight days on a full wind. The heavy brass trapezoidal shaped plates are are held together with four robust turned pillars or posts. These plates are nice and long, heavily cast and finely finished. The movement is secured through the back of the case with four large screws. The access is from the back. The gearing is well executed and features a deadbeat escapement and maintaining power. The pendulum is suspended from a T-bridge mount that is secured to the front of the movement. The pendulum is constructed with a shaped wooden rod that is treated with a gilded finish. This rod supports a heavy brass faced bob that measures approximately 8.5 inches in diameter. At the bottom is large brass rated nut which is used to adjust the pendulum length. This would be done to adjust the clocks accuracy. This pendulum beats seconds or sixty beats a minute. Clocks that are designed like this one are generally excellent timekeepers and vary only seconds a month when properly set up. This example is designed to run eight days on a full wind.

This very unusual example was made circa 1840.

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