This is a powerful lightweight pocket rule, with performance equal to a much larger straight rule. I have an idea id like to try that involves a circular slide rule that is an adaptation of a circular slde rule. Updated november 3, 2001 types of slide rules and their scales. A practiced user with a good quality slide rule can multiply, divide, exponentiate, take logarithms and perform trigonometric operations to three significant figures more quickly than with an electronic calculator.
The e6b flight computer, nicknamed the whiz wheel or prayer wheel, is a form of circular slide rule used in aviation and one of the very few analog calculating devices in widespread citation needed use in the 21st century. Slide rule scales build your own sr slide rule museum. Fivescale circular with slide out panel containing a wealth of useful conversion tables and data. Instructions for using a slide rule project gutenberg. Sinco scientific instruments circular slide rule no. Our next project will include a circular slide rule in the design of the watch. This is a beautiful sinco model no 250 circular slide rule in pristine condition. Faber castel 283n this rule was one of the most comprehensive produced. Sold by designstein llc and ships from amazon fulfillment. Concise 28 a fairly basic but well known circular rule. Computing instruments halden calculex circular slide rule. Slide rules usually look like a narrow ruler, but for todays demonstration we will be building a circular slide rule. Rapid and simple calculation of range to target, based on a measurement of the target with a mildot reticle, by aligning the estimated target. Background on logarithms, history of the slide rule, and how it all works.
This page gives my own templates see below for constructing a circular. The pdf files are to scale so just be careful in cutting the center hole. A compact 80mm3 14 inch pocket circular slide rule, with conversion factors and formulas on rear face. The author was managing director of the company that made unique slide rules but as this was a comprehensive range it will be useful for other rules as well. By the time i finished engineering school in 1963, the slide rule was a. Old pilots watches feature these slide rules, and any newer pilotstyle watches also have this. Circular slide rule calculators wheel chart calculators. The first circular slide rule on this link uses a cd case as the basis for the slide rule. A slide rule in a circular form whose advantages over a straight slide rule are its precision, because it is equivalent to a straight slide rule many times longer than the circular slide rule s diameter, and ease of multiplication, because the scale is continuous. Multiple speedtimedistance calculations can be performed handsfree at a glance with a slide rule. Datalizer wheel chart calculators are designed for quick calculating. A slide rule adds the logarithms of two numbers to multiply them. Make your own circular slide rule the slide rule is a simple but elegant mechanical calculator.
Most students learned slide rule use on the linear slide rules, and did not find reason to switch. Distribute or use this work to protect the project gutenbergtm mission of promoting the free distribution of electronic works. Notice one inherent problem with the pdf file that serves as a pattern for this slide rule. All slide rule specimens, scans, photos and ephemera are organized into one of 51 galleries. Manual for gilson midget circular slide rule description this twelvepage booklet was received with 1998. Later i thought a circular slide rule would be easier to make out of paper. A standard manual for circular slide rules, direct from concise in the fall, 2002. Bissaker slide rule 1654 circular slide rule king pocket calculator 66 sclales thacher calculator 30 ft. Making an oddball circular slide rule practical machinist. Scales to make a circular slide rule using a cd case by ying hum. Slide the c scale so that the 1 or 10 is over on the d scale. Again, id recommend printing them on the front and back of the same piece of paper, just like they would come with a sterling slide rule.
Customers tell us that they know circular slide rule style calculators as. Dozens of scales are included and numerous features that could never exist on a physical slide rule are also included, such as color options, numeric displays of the values under the hairlines, and so on. Otis king another classic rule this time cylindrical. The following was written in 1999 by jason waskiewicz. Get started with any of our readytouse laser cutting design templates and customize it to fit your needs, whether its electronics enclosures, faceplates, or anything in between. How many days will it take for 8 men to finish the job. This is a circular slide rule first created in the 1930s for aircraft pilots to help with dead reckoning. The basic advantage of a circular slide rule is that the widest dimension of the tool was reduced by a factor of about 3 i. A large number of templates for circular slide rules are given, along with many other templates. This gallery has a wide variety of circular slide rules and many. With the aid of scales printed on the frame it also helps with such. Teach yourself the slide rule by burns snodgrass a pdf file a pickworth.
Very nice rule, complete with vinyl slip case and manual. It is a very good example on how the divisions of the slide rule scales are calculated. One slide rule remaining in daily use around the world is the e6b. Oughtred society slide rule reference manual the oughtred. Get the best deals on circular slide rule when you shop the largest online selection at. Spheres slide rule universe is a repository for information, pictures, history and links to sellers, other sites and experts, and an online store.
Includes the original box, case, warranty card in plastic wrap, and instructions. Sophisticated models have more scales than my simple circular slide rule, making for greater flexibility. Get the best deal for circular slide rule from the largest online selection at. The left index for the b scale is aligned with 4 on the left half of the a scale. I did a lot of research on them, and when i did, i discovered that there are circular variations. The slide rule is a simple but elegant mechanical calculator. One of the nice things about circular slide rules is that youll. If both the outside and inside circular rules have identical scales with a full range from 10 to 90, then you have what are known as c and d log scales. These were used by pilots to do simple arithmetic, conversions and other calculations in an era before gps and calculators. Im not an expert im also not old enough to have learned slide rule use in school.
Circular slide rule article about circular slide rule by. With this circular slide rule, inverse proportion should always be done between d and cl. After seeing phil bs making your own slide rule, i went on a huge slide rule kick. A slide rule is a mechanical device that uses the alignment of numeric values marked on sliding scales to perform mathematical calculations. It provides instructions for using the midget circular slide rule manufactured by gilson slide rule company of stuart, fla.
My slide rules this gallery is in the process of some updating, as many of the scans are from the 1990s, when my way of taking pictures was to put the slide rule on a flatbed scanner and hope it came out reasonably clearly. The slide rule the book, written by florian cajori, is the standard. This circular slide rule comes with its original leather wallet and the 95 page soft leather back instruction manual, which also contains numerous rules, tables, and formulae to facilitate the use of this particular slide rule. The mildot master is an analog calculator designed along the principle of a slide rule, utilizing logarithmic and inverse logarithmic scales developed specifically for performing the following operations. As you can see from the photos the slide rule has almost no wear and tear. May 18, 2016 the first of a series of videos explaining the basic slide rule.
How to use a circular slide rule caliper timepieces inc. I found a good pdf of circular slide rule scales and i need to overlayresizeedit text and graphics. If you use a different pdf reader, your procedures should be quite similar. The single slide rule is designed for beginner, consisting of k, a, b, ci, c and d scales only. The cursor aligns with 9 on the left half of the a scale. Many pilots watches made make use of a circular slide rule on the bezel of the watch. Slide and wheel chart specialists datalizer slide charts. Spheres circular slide rule archive circular slide. Concise circular slide rules concise typee weights and measures, conversion tables and circular slide rule. An historical introduction to slide rules from the museum of hp calculators.
The slide rule, also known colloquially in the united states as a slipstick, is a mechanical. This program replicates the most common types of slide rules. Slide chart design, development and production services. Using a slide rule is a bit of a lost art but with a bit of practice, it can be a useful everyday tool.
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