This large, book-shaped box has a red binding and gilt edges. The inside contains a drawer and three shelves carrying the instruments, some of which are missing. There are now several proportional compasses, reduction compasses and dividers; polymetric compasses (i.e., capable of multiple measurements); a plumb level; a few squares including a double square; a radio latino; several rulers; a quadrant; a surveying compass; a trigonometer, and a cylindrical weight tapering to a point and fitted with a ring.