Hoekmeter, anonymous, 1582 Canvas Print
The object consists of the following twelve movable parts: two arms composed of three layers of metal (in which the middle part of the right arm can be plotted again up to an angle of 90 degrees), as well as a third arm, which by the construction always remains the bisectrice of the angle, which the other legs make and is at right angles to it, if they are in line with each other; two connecting parts, one end of which is riveted on an arm each time and the other end is attached to the slide, which is mounted on the middle arm; five short plates (i.e. visors), which are attached with a hinge to each end of an arm, and which can be erected at right angles (the sixth on the middle arm is missing). On each picture, which has the circumference of a semicircle at the top with a perpendicular notch on it, a small round opening is placed in the middle to be able to see through it. On the left arm the inscription is: Pro declinatione muri engraved, on the right arm the letter D and the year 1582. On the smooth bottom of each arm, a radius is engraved from the center of the circular connecting part to the center of the other end, as well as the numbers 1 to 10. On the middle arm, which rests in closed state on the two other arms, scales are engraved left and right, walking left from 3 to 15 and right from 10 to 90 and then repeated. In the left arm, a round hole is drilled near the circular connecting part. The part of the middle arm, over which the slide, which is contoured and engraved as an curly brace, can be moved, has oblique sides towards the bottom, on which scales are also engraved with right 0 to 90 and on the left the terms vmbra recta and versa.
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