Loga 75T circular slide rule used display box 1960 Switzerland

This high quality metal circular slide rule that measures 30 cm or 12 inches in diameter. This one comes in a sort of display box, a little different from one that sold some time ago, so I assume it to be a later addition, but does the job nicely. This one is also from the 1960’s. This is the elaborate model 75T for all the basic calculations using square roots, sinus and tanges and log scales. The size gives the user extra accuracy and to enhance this even further the cursor has additional increments on the end scale. It was ment to be used, holding in one hand to turn the knob on the back to manipulate the centre scales. The cursor could be set with the other hand. There was also a special stand available to make it hover on your desk (not included), It can also sit securely in the hole in the box for setting it upright. The slide rules shows clear signs of use and age (but this does not distract, all information is perfectly readable and the green color is still very vibrant. The cursor is in great condition. Check the attached video on how to work your vintage man tool : slide rule operation instructions!