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Maker, George Jamison, Charing Cross, London, England, c. 1800. Movement net 18"h x 8"diameter, overall with base 22"h x 10.5"diameter. Two plane anchor escapement with divided lift, i.e. the two pallets are in different planes relative to each other. One half second pendulum with engraved silvered Earth globe as the bob. Rack and pinion striking on the hour. Two train chain fusee, with Harrison maintaining power, eight day duration. Silvered chapter rings and fire gilt ormolu decorations and tripod frame.

A view of the ormolu molding surrounding the apex dial. Notice the small moon. It is difficult to see in the photo, but it has a light and dark set of hemispheres.  That moon's rotation gives the phases the moon also known as a 'Halifax moon'. But what makes this example even more interesting is that the moon also circles around the center arbor to indicate the age against the inner dial ring marked 1 though 29 1/2.

The small calendar indicator apertures for day, month and date. 

Notice how the strike components, in this view the strike rack and pawl, are spring biased. In a conventional movement equipped with rack striking this is accomplished via gravity, but in a horizontal configuration these parts need the bias of the leaf springs. 

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