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. Customers tell us that they know circular slide rule style calculators as. Jeppesen, asa, this simple and elegant device used by pilots for various. The first circular slide rule on this link uses a cd case as the basis for the slide rule. These come in a variety of materials and sizes id recommend the aluminum ones, and can be picked up rather cheaply at any of the online. I f youve ever seen a watch with a slide rule bezel and havent known how to use it, we have a little guide for you. Pricing varied by retailer, however pickett did offer demonstration slide rules in 4 foot and. They made their own 101c circular rule, but it is a very simple design.
The slide rule is used mainly for multiplication and division, and also for scientific functions such as roots, logarithms and. Instruction booklet that came with the conray radiological tables and circular slide rule. Takeda concise 300 circular slide rule diameter 412, c scale length 10 made in japan this concise circular slide rule has the standard 10 scales arranged on a doublesided plastic disc of about 5 diameter. Updated november 3, 2001 types of slide rules and their. As graphical analog calculators, slide rules are closely related to nomograms, but. 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 use in the 21st century. Insurance wheel is a useful tool for insurance brokers as well as insurance carriers. Circular slide rule calculators wheel chart calculators. High, since some of the problems were of the push these buttons in this order to graph this equation type. With some of them there were two disks, the outer one being rebated to take the inner. The top picture shows the setting for the multiplier 8 in the sum 8.
Slide rule definition of slide rule by merriamwebster. With others there was a flat circle very much the equivalent of the slide of a linear rule with static disks outside and inside it. Overview of the major categories of slide rules, and descriptions of common scale labels and meanings. Bissaker slide rule 1654 circular slide rule king pocket calculator 66 sclales thacher calculator 30 ft. The slide rule is used mainly for multiplication and division, and also for scientific functions such as roots, logarithms and trigonometry, but usually not for addition or subtraction. An e6b flight computer commonly used by student pilots. With some of them there were two disks, the outer one being rebated to take the inner one. Compared to a calculator, a slide rule is severely limited in its accuracy. Description of dials of fowlers longscale calculator. The slide rule also does not tell you the sign of your result. Jeppesen, asa, this simple and elegant device used by pilots for various flight calculations can also do basic multiplication and division on the circular slide rule portion. Circular slide rule article about circular slide rule by.
After a buying or making a slide rule, if the original manual isnt available online many are, theres a superb illustrated tutorial on slide rule use pdf download offered on the oughtred. It became a manufacturer of military electronics devices and digital computers. The linear sic models numbers are normally a relay model number with an extra zero relay 102 sic 1020. These were used by pilots to do simple arithmetic, conversions and other calculations in an era before gps. Scientific instruments company international slide rule. Theres a good selection at the international slide rule museum website, including an ingenious circular rule using a cd case by ying hum, see below. Around the periphery of the navitimer is a rotating bezel that contains a functional circular slide rule a.
The appeal of slide rules for use and as collectables. Get the best deals on circular slide rule when you shop the largest online selection at. My slide rules this gallery is in the process of some updating, as many of the scans are. This is peculiar, but it is intended that this rule will be used in conjunction with the one with two fourdecade loglog scales, normal and reciprocal, as part. This software tries to replicate the slide ruler which was so popular way back than. Slide rule for windows is a revolutionary new software it is a single sided slide ruler for windows 3. These operations are made mechanical by moving circular scales with logarithmic distances marked on them, which can added or subtracted from one another. The radiological tables and circular slide rule were compiled and designed to. A stiff paper slide rule made from the template in cliff stolls scientific american article. A large number of templates for circular slide rules are given, along. Apr 16, 2020 the signature beaded bezel and circular slide rule are the same, as is the movement, the cosccertified automatic breitling caliber 17, and the clean, threehand dial.
This is a circular slide rule first created in the 1930s for aircraft pilots to help with dead reckoning. A large number of templates for circular slide rules are given, along with many other templates. Background on logarithms, history of the slide rule, and how it all works. Updated november 3, 2001 types of slide rules and their scales. Insurance wheel replaces the old circular slide rules. Proportional calculator circular slide rule casio edifice chronograph mens watch analog 3h3ed. The lower picure shows the answer on the leftmost cursor. The navitimer was created in 1952 and to the best of my knowledge, it is the origin of all circular slide rule flight computer watches. I have used this software to build demonstration sliderules for papers that i have prepared for the international meetings and can highly recommend it. The slide rule, also known colloquially in the united states as a slipstick, is a mechanical analog computer. In addition to performing basic arithmetic, slide rules. Sep 16, 2014 before there were computers, insurance companies used a round slide rule device called an insurance wheel to calculate how much premium was to be refunded for a policy cancelled before its expiration date. Old pilots watches feature these slide rules, and any newer pilotstyle watches also have this. Spheres pickett slide rule company archive slide rules online.
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 rules. Our original problem was 410 x 9, and we read an answer of 3. Circular slide rule based on my guess concerning nystroms calculator design. 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 use in.
Circular slide rules come in two basic types, one with two cursors. Mannheim slide rule 1850 faber castell 283n nestler 23r mannheim issac newton put 3 scales in parallel in 1675 to compute cubes, and proposed the cursor in 1677, but was ignored. Make offer 1936 vintage binary circular slide rule and case binary slide rule. Our next project will include a circular slide rule in the design of the watch. This program replicates the most common types of slide rules.
The signature beaded bezel and circular slide rule are the same, as is the movement, the cosccertified automatic breitling caliber 17, and the clean, threehand dial. For example, a 10 cm circular would have a maximum precision equal to a 30 cm ordinary slide rule. Slide rule circular logarithmic ruler kl1 ussr calculator. With the aid of scales printed on the frame it also helps with such. Using a slide rule is a bit of a lost art but with a bit of. Concise circular slide rules concise typee weights and measures, conversion tables and circular slide rule. The resulting company, bunkerramo, was based in trumbull, connecticut. As far as i know, only one commercial slide rule was ever made that uses this idea of a true continuous spiral ll scale the fearns, which has an ll scale going from 1. Rule has operating instructions on the face, and was a low cost and popular rule widely used in retail. Fowlers calculators, like all slide rules, are based on the properties of logarithms, which enable multiplication to be performed by addition and division by subtraction. Slide rules manufacturers companies in the united states.
The catalog evidence and the date on the slide rule make it reasonable to. The advantage of circular slide rules, is that the dimensions can be small enough to. This is the fundamental identity underlying all slide rule calculations, and it is worth. Felsenthal fae15 stadia computer circular slide rule. An image of various slide rules from the collection of the division of medicine and science. Erics where to buy slide rules page erics slide rule site. Fivescale circular with slide out panel containing a wealth of useful conversion tables and data. Round the original problem to convenient numbers and solve it in your head. The slide rule is a simple but elegant mechanical calculator. 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. Circular slide rules come in two basic types, one with two cursors, and another with a movable disk and a cursor. Datalizer wheel chart calculators are designed for quick calculating. Another example of a simple slide rule would be the e6b flight computer.
Around the periphery of the navitimer is a rotating bezel that contains a functional circular. Before there were computers, insurance companies used a round slide rule device called an insurance wheel to calculate how much premium was to be refunded for a policy. Conray radiological tables and circular slide rule. Many pilots watches made make use of a circular slide rule on the bezel of the watch. Abandoned with the advent of handheld calculators, computers. Computing instruments halden calculex circular slide rule. 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. Slide rule simple english wikipedia, the free encyclopedia. Free shipping on many items browse your favorite brands. Hundreds of companies around the world were involved in the production of slide rules.
Its usage is identical to that of a real slide rule, but tim has introduced two major enhancements. Rules of this type were made by concise, aristo and fearns. The slide rule was used for over 400 years as a calculatingestimation tool. Brand new 7 inch circular blue date finder slide charts from datalizer this desk sized 7 inch plastic date finder is a highly requested circular from business. The above is a fun demo design but with modern printers and some craft andor wood making.
Fivescale circular with slide out panel containing a wealth of useful. I learned how to use a slide rule for basic math in first grade, just because it was neat after all, if dad the engineer uses one, it must be cool. These were used by pilots to do simple arithmetic, conversions and other calculations in an era before gps and calculators. A slide rule for real programmers full page reload. In 1952, swiss watch company breitling introduced a pilots. This software tries to replicate the slide ruler which was so. 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. Using a slide rule is a bit of a lost art but with a bit of practice, it can be a useful everyday tool. The concise company of japan still manufactures circular slide rules which can be. The slide rule, or slipstick, is a mechanical analog computer. Circular slide rule for sale in uk view 58 bargains.
Search or browse our list of slide rules manufacturers companies by category or location. Picketts popular plastic commercial circular slide rule, with markup and discount functions. Before there were computers, insurance companies used a round slide rule device called an insurance wheel to calculate how much premium was to be refunded for a policy cancelled before its expiration date. Unfortunately because of the screen resolution, numbers are displayed digitally. How to use a circular slide rule caliper timepieces inc. Note that on slide rules that have the sic diamond logo, the rules have serial numbers but do not have the pi. As graphical analog calculators, slide rules are closely related to nomograms, but the former are used for general calculations, whereas the latter are used for applicationspecific computations the slide rule is used primarily for multiplication and division, and also for functions. With the aid of scales printed on the frame it also helps with such miscellaneous tasks as converting time, distance, speed, and temperature values, compass errors, and.
Still made today as a cardboard slide chart by several companies. This page gives my own templates see below for constructing a circular. Get the best deal for circular slide rule from the largest online selection at. Takeda concise 300 circular slide rule diameter 412, c scale length 10 made in japan this concise circular slide rule has the standard 10 scales arranged on a. All orders will be sent st class recorded delivery a signature is required on delivery, delivery days once dispatched.
The most familiar form is the linear slide rule, but there were also circular ones like the univacs as well as cylindrical slide rules. You can enter and read a number typically to two or three. Spheres pickett slide rule company archive slide rules. Slide rule in fine condition, leather case in very good condition, case does show some age and wear see photos. Slide rule definition is a manual device used for calculation that consists in its simple form of a ruler and a movable middle piece which are graduated with similar logarithmic scales. Dozens of scales are included and numerous features that could never exist on a. Although some overseas companies continue to make slide rules and retailers. One slide rule remaining in daily use around the world is the e6b. Slide rule precision, accuracy and significant digits. Slide rules that are round offer the length of a 10 rectangular slide rule in a pocketsized roughly 3. The top picture shows the setting for the multiplier 8 in the sum 8 x 6. This circular slide rule was used to calculate the most efficient code for the.
This one is for a generalpurpose rule, except that hyperbolic functions are present, and loglog scales omitted. Breitlings first navitimer for women is geared to collectors. Mannheim slide rule 1850 faber castell 283n nestler 23r. The first of three templates to build a circular slide rule background. This circular slide rule comes with its original leather wallet and the 95.