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MECHANICAL WRISTWATCH Welcome to Romantic Watch the team of research of horology. We are most pleased that we can suggest an interesting type of modern and vintage watches with cognitive history of origin. We consider our activity as one of extreme importance, not only to provide selling of watches, but also research of exceptional horology works of art. All our items have served, tested, restored professionally they are ready to take a worthy place in any collection. Thank you for your interest to our items! Thank you for your feedbacks that us inspire to perfection and qualitative work! Team of Romantic Watch. 1967 USSR SLIDE RULE KL-1 CALCULATOR OF WATCH TYPE The KL-1 is intended for performing trigonometric and mathematical operations. Made since 1967 under the direction of the USSR Ministry of Instruments and Control Systems to supply small calculators to the Soviet scientists, military pilots and officers. The T scale runs from 1 to 45 degrees in spiral approximately 1.75 periods long. The portion less than 5.6 degrees can be used as an ST scale. S and T scales are calibrated in degrees and minutes. SPECIFICATION OF THE SLIDE RULE The circular slide rule consist of housing with two crowns (knobs), 2 dials (one of which revolves with the aid of the black crown), 2 pointers (which revolve in unison with the aid of the red crown) and a fixed indicator. The fixed indicator is on side 2, directly aligned with the black crown. Steel case with special original synthetic glass for 2 faces of the slide rule. Side 1: 3 scales on the fixed dial. 1.The outer scale - for basic calculating. It is the inverse of the inner moveable scale on side (equivalent to a DI scale). 2.The middle scale S - for calculating the sines oa angles. 3.The inner scale T - for calculating the tangens of angles. Side 2: 2 scales on the moveable dial. 1.The outer scale - the scale of the squares (equivalent to an A scale). 2.The inner scale - for basic calculating (equivalent to C scale). Functions: multiplication, division, squaring, extraction of a square root, finding of trigonometric functions of a sine, finding of trigonometric functions of a tangent, finding inverse trigonometric functions, calculation of the area a circle. ATTENTION!!!DO NOT PULL OUT THE CROWNS FROM THE CASE!!! BRIEF HISTORY OF THE SLIDE RULE The slide rule calculator, also known as a slipstick, is a mechanical analog computer. The slide rule is used primarily for multiplication and division, and also for "scientific" functions such as roots, logarithms and trigonometry, but does not generally perform addition or subtraction. Slide rules come in a diverse range of styles and generally appear in a linear or circular form with a standardized set of markings (scales) essential to performing mathematical computations. Slide rules manufactured for specialized fields such as aviation or finance typically feature additional scales that aid in calculations common to that field. William Oughtred (1575–1660) and others developed the slide rule in the 1600s based on the emerging work on logarithms by John Napier (1550-1617). Before the advent of the pocket calculator, it was the most commonly used calculation tool in science and engineering. The use of slide rules continued to grow through the 1950s and 1960s even as digital computing devices were being gradually introduced; but around 1974 the electronic scientific calculator made it largely obsolete and most suppliers exited the business. SHIPPING & SET To big a regret this shipping in Africa is impossible. In other countries: Air Mail shipping & handling - $15,00. Your package will arrive during 14 -18 days with used slide rule and manual on English. If You are not satisfied by Your purchase or watch do not work after Air mail deliveries, please communicate with us. We always reach a consensus with buyers who communicate. PAYMENT Please, Attentively read the Seller's payment instructions. Your bid means that You accepts all conditions. Pay after the ending of auction: P.S.If you have any other questions, please get in touch with Team of Romantic Watch! The best resolution for viewing: 1024x768 Powered by eBay Turbo ListerThe free listing tool. List your items fast and easy and manage your active items.
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