Circular slide rule KL-1 is designed to perform the most common mathematical operations in practice: multiplication, division, combined operations, squaring and cube, extracting a square root, finding the trigonometric functions of sine and tangent, as well as the corresponding inverse trigonometric functions, calculations the area of ​​a circle, counting the weight of round sections.The slide rule consists of a case with two heads, two dials, one of which is rotated by a head with a black dot, and two hands, which are rotated by a head with a red dot. There is a fixed pointer opposite the head with a black dot above the movable dial.
On the movable dial there are two scales: the internal (main) - counting and external - the scale of squares of numbers. Three scales are applied on the fixed dial: the outer scale is counting, similar to the inner scale on the fixed dial, the middle scale is the angle values ​​for reading their sines and the inner scale is the angle values ​​for reading their tangents. PS: Dear customers!!! I really appreciate that you visit my store. If possible, I will expand the range of my products. Don't forget to subscribe to me. I try to describe all my lots in as much detail as possible in the condition of the item itself. Please be very careful! If something goes wrong, please do not rush to conclusions, everything can be settled))). All parcels are shipped by air. Estimated delivery of the lot is from 13 to 23 working days. There are certainly delays and this can be sorted out! I wish you happy shopping!