During the third quarter of the 18th century a type of domestic clock was produced in Friesland which was entirely new to the province. The case was a simple hanging version of an Amsterdam longcase clock with the movement of the Friesland bracketed stoelklok modified to an anchor escapement. The case of the common Friesland staartklok consists of an upper part which contains the movement and dial, and a lower part housing the pendulum. The total height of the case is about 2 ft. 3 in. ; as this is about half the height of a longcase clock, the Friesland clock is sometimes referred to as a half-case clock. Mostly, the case is made of oak, French-polished to a reddish hue. Other examples occur in elm and, from the third quarter of the 19th century, mahogany. In the east Netherlands some Friesland clocks are found with whitewood cases, most, though perhaps not all, originating in the neighboring part of Germany. At the level of the pendulum bob there are so-called 'cheeks' on either side of the case, in the front part of which is a sliding wooden panel with an oval 'window' instead of the usual pendulum aperture. Around this oval window an ornamented plate is mounted, lead in older models, moulded brass in later ones and thin brass plate in cheaper examples. The pendulum bob in the normal Friesland clock has a diameter of almost 2 3/4 in. , although in office clocks and certain others it may be larger. On the clock hood are three little wooden plinths bearing wooden figures, or vases with gilded glass balls, or ornaments in thin brass plate. The painting of the dial is exceptionally beautiful in some cases, but in general it is very simple. Around the chapter ring, spandrel mounts of thin brass representing the four seasons are usually added. There are a number of variations on the standard Friesland clock, listed below. Variations of the movement. (1) Moon phases with or without indication of date. (2) Automata movement attached to the anchor arbor and therefore in continuous motion, or linked to the striking work and therefore intermittent. The display is usually above the chapter ring, but may sometimes be found beneath it. Since all mechanical additions clearly hinder the functioning of the escapement and therefore the proper running of the clock, they were often totally or partly removed during later repairs. (3) Fitted with repeating rack striking instead of locking plate striking. (4) An organ or musical cylinder fitted (rare). Variations in the size of the clock. (1) Abnormally large size, the so-called 'burgomaster's' clock (rare). (2) The hood has its normally flat top decorated with carved leaf cresting or with a carved or painted broken pediment. The dial arch is usually filled with fine engraving or painting. (3) A luxuriouly executed clock case, in which case the clock is often larger than usual. The case may be completely covered with carving, or finely painted, or inlaid with other kinds of wood, or made with a more valuable kind of wood. (4) The so-called 'short' Friesland clock or 'big head' of which there are two types. (5) Smaller examples, such as the office clock or notary's clock which only differ from the standard Friesland clock in having a smaller movement and case; they are relatively rare. (6) Very small examples, the so-called 'skipper' clocks. As with the bracketed stoelklok, the Friesland clock has a small version for use in inland navigation, although there is some doubt whether they were specifically manufactured for that purpose. The back panel of these clocks does not contain a pendulum, and it is pierced with a Turkish knot motif or star design.