Two wood tablets covered on one side with cloth that serves as their hinge. Paper with manuscript markings in red, black and blue ink pasted over cloth. Recto--Quadrant inscribed within a square. For latitude 41 degrees. Equal hours drawn as 2 sets of straight lines for winter (8-5) and summer (5-7) hours. Half-hour intervals. Arabic numerals. Red figures of zodiacal constellations on right edge in 4 columns listed from equinoxes to solstices. Limb divided 0-90 degrees every one degree. Two sides of square similarly divided. Plumb-line and one sight missing. Other sight is a brass pin; bent down. Verso--plain exterior of wooden tablets. Contains only inked inscription of maker.
