Dial in the shape of a small box. A compass for orienting the instrument is fitted into the base (the magnetic needle is missing). There is also a windrose. The gnomon consists of a string that stretches into alignment with the celestial axis when the box lid is opened. Inside one of the lids is an horary quadrant with markings for latitudes from 40° to 54° (corresponding to all of Europe), in 2° increments. To determine the hour at different latitudes, the string had to be shifted to the desired latitude. This is a typical specimen of a low-priced instrument.