![]() It also means that the number under the nose minus one of the eye numbers will equal the other eye number. The scales are such that when two numbers show up in the eyes, the number under the cat’s nose will be the sum of the other two numbers. However, there is a cursor that appears like a cat’s face - it isn’t transparent, but there are holes for the cat’s eyes and nose. The Cat is more like a single ruler with three scales on each side of the ruler. The Smarty Cat is very different, yet it can add, subtract, multiply, and divide small integers. If you look a bit to the right, you can see that 1.5 x 1.3=1.95, and 15 x 1.3=19.5. The 2 on the C scale lines up with the 3 on the D scale. Now look under the crosshair on the cursor. It lines up to 1.5 on the D scale (or 15, or 150 they are all the same). See the 1 on the C scale? That’s the same as zero in the simple illustration above because 10 0=1. ![]() Look at the scales on the rule in the picture. There’s a cursor (a clear plastic slide) that rides over the rulers so you can precisely tell where the rules line up. If you add 1 and 2 you get 3 and 10 3 is, in fact, 1000 which is the right answer. Using base 10 logarithms, the marks on the ruler will be 1 and 2 (because 10 1=10 and 10 2=100). Let’s try a multiplication example: 10 times 100. But if you can convert your numbers into logarithms, add the logarithms, and then back out to a regular number, you can multiply. Here it lines up with the 8 mark, which is, of course, the correct answer. Now you count off 3 marks on the second ruler and that position on the first ruler will indicate the result. You count off 5 marks on one ruler and line it with up the zero inch mark on the other ruler. Imagine having two rulers marked in inches or centimeters - it doesn’t matter (see the adjoining image). Real Slide RulesĪ regular slide rule takes advantage of the fact that you can multiply and divide by adding logarithms. It isn’t exactly a slide rule but it sort of is if you stretch the definition a bit. But I recently picked up a real oddity that I had to share: the Smarty Cat. I also have the less common circular and cylindrical slide rules. I have a large number of what I think of as normal slide rules. If you don’t, it probably doesn’t surprise you. They also don’t need electric power and are therefore nuclear explosion-proof.You may remember that I collect slide rules. For example, fuel consumption as a function of humidity and pressure. “The calculations are sufficiently accurate and quick. “There are several reasons for using slide rulers,” says Yarl Qman, a former civilian on-board technician who worked with Soviet aircraft. ![]() ![]() Slide-rule aficionados who examined the video noted on social media that the E6B is much more advanced than the linear slide rule used by the crew of the Tu-160. A retail listing for the E6B on the Aviation Supplies and Academics (ASA) website describes it as “the best slide-rule-style flight computer on the market, with solid aluminum construction and easy-to-read lettering.” The E6B slide rule is sometimes used by American cadets for calculations of the flight path, speed and altitude. ![]() Miller says the E6B slide rule is used in these circumstances for calculations of the flight path, speed and altitude. That team trains for an annual competition where flight planning must be completed using a slide rule.” One of those Airmanship courses leads to the possibility of joining the Academy’s Cessna Aircraft Flying Team. “However, each cadet is required to take an Airmanship course as part of their experience as a cadet. “ long replaced by modern technology - IPads, computers, calculators, as well as other technology,” says Dean J. ![]()
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