Vintage Slide Rule / logarithmic Scale Bulgaria 1970's Slide Rule / Engineering Tool Old Architect Gift / Analog Computer
I present you calculating line /marked - 1971/ is a portable mechanical computing device /in a plastic case/, usually consisting of three assembled calibrated lines and sliding cursor used to report interim results. Was used during in the 1970s like a electronic calculators is widely used for rapid estimates (with highest accuracy to two decimal places) scientific and engineering calculations.
Most slide rules consist of three lines with the same length, which are assembled so that the average can move longitudinally with respect to the other two. The outer two lines are fixed relative to one another. Sliding cursor with one or more vertical lines used to mark the subscore on one of the rocks.
Overall mathematical calculations are carried out markers for the moving average line are aligned with those of any external rocks. Tags engraved or printed on the lines are precisely placed, so as to allow the performance of a number of mathematical operations. The geometry of the markers determine which operations can be performed.
Size: length-15 cm / 5.9 in
width - 3 cm / 1.2 in
In excellent condition!
The item will be shipped within 3 days of purchase and tracking number will be provided.
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Europe - 6-8 working days.
Everywhere Else and United States and the rest of the world is about 12-16 business days. Please, keep in mind that International mail goes through numerous security checks, so delivery times may vary. Thank you for your patience and understanding!
Of course always possible to obtain a delay for various reasons. If you do not receive your order 22 working days after dispatch, please contact me and I will solve your problem.
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Returns & exchanges
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Be sure you love it! All sales are final. All item are sold in "as is" condition. Vintage items are expected to have some wear and I always try my best to accurately describe an item and any conditions it may have and believe we should celebrate the uniqueness of each piece - flaws and all! Please contact me prior to purchase if you have any questions or would like to see additional photos.
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