Go to the pocket slide rules go to the circular slide rules. Most students learned slide rule use on the linear slide rules, and did not find reason to switch. Computing instruments halden calculex circular slide rule. 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. This site hosts a portable package of derek ross, stefan vorkoetters, and brian bartholomews virtual slide rules browserhosted slide rule simulators.
This page gives my own templates see below for constructing a circular. Once all the pilots had a rule of this kind on the clock, knowing how to do multiplication and division quickly could save your life. The single slide rule is designed for beginner, consisting of k, a, b, ci, c and d scales only. The top picture shows the setting for the multiplier 8 in the sum 8 x 6. Free shipping on many items browse your favorite brands. In contrast, a tachymeter scale is hyperbolic and typically has numbers that run in from infinity down to sixty. 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. The lower picure shows the answer on the leftmost cursor.
The slide rule, also known as a slipstick, is a mechanical analog computer. Below you will find a postscript template and instructions for building your own pocketsized circular slide rule, like the one pictured at left. Bissaker slide rule 1654 circular slide rule king pocket calculator 66 sclales thacher calculator 30 ft. Slide rules usually look like a narrow ruler, but for todays demonstration we will be building a circular slide rule. Old pilots watches feature these slide rules, and any newer pilotstyle watches also have this. Here you will find a collection of some of the most prominent models carefully handcrafted and simulated or emulated in javascript.
Circular slide rule calculators wheel chart calculators. Two are publicdomain photographs of antique slide rules. A large number of templates for circular slide rules are given, along with many other templates. This software tries to replicate the slide ruler which was so popular way back than. 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. Many pilots watches made make use of a circular slide rule on the bezel of the watch. It is a free, javabased, incredibly precise and configurable scientific slide rule that you. The appeal of slide rules for use and as collectables.
Although its slide rule features are limited to the unlabelled cd scales on the circular front portion, this lowtech device is commonly used by pilots for flight path calculations, wind correction, fuel consumption, etc. 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 there are many different styles of slide rules. This program replicates the most common types of slide rules. How to use a circular slide rule caliper timepieces inc. The shirt and tie evolved into a tshirt sporting some software advertisement. One of the nice things about circular slide rules is that youll never run into the run the cursor off the end of the slide rule problems, since there is no end to a circular slide rule. Background on logarithms, history of the slide rule, and how it all works.
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. Using the language, symbols, and graphics relevant your industry, we reinvent the wheel for you. Circular slide rule based on my guess concerning nystroms calculator design. Slide rules that are round offer the length of a 10 rectangular slide rule in a pocketsized roughly 3. Datalizer wheel chart calculators are designed for quick calculating. Spheres slide rule universe is a repository for information, pictures, history. Etsy is the home to thousands of handmade, vintage, and oneofakind products and gifts related to your search. Circular slide rule svg file by kq5pz85m 5mm mdf laptop stand eps file by sociable cogs gears eps file by geekphysical star trek combadge svg file by kq5pz85m thrustsheets for mss suspension kit golf r for kits with v1 rear adjusters. Round the original problem to convenient numbers and solve it in your head. Fivescale circular with slide out panel containing a wealth of useful conversion tables and data. 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. 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 there are many different styles of slide rules. I worked at eastman kodak for 30 years as a software engineer specializing in realtime. These were used by pilots to do simple arithmetic, conversions and other calculations in an era before gps and calculators.
Customers tell us that wheel charts are also known as. And the slide rule has become an electronic calculator. You should confirm all information before relying on it. 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 diameter, and ease of multiplication, because the scale is continuous. Also because of all the detail, the 30loop spiral slide rule converts to a lowrez bitmap data image while you move it, then back to a vector based image as soon as you release. Circular slide rule calculators wheel chart volvelles. I particularly like the simulation of the pickett n 525es, a statistical slide rule and one that is uncommon. Fowlers longscale calculator vest pocket modelrx for engineers, draughtsman and science students supplied complete in leather case 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. Tim has provided a free downloadable software emulation of the sliderule.
The slide rule was used for over 400 years as a calculatingestimation tool. As many of you know, watches with slide rule functions have 2 logarithmic scales the outer of which turns. 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. Vintage logarithmic slide rule circular aviation calculator ussr rare. Read both the multipliers and the results on the linear scales on the cursors not on the spiral. Slide rule software sphere researchs slide rule universe.
Includes a brief side show slide show of famous and interesting slide rules, most of which are in the authors collection. 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. Updated november 3, 2001 types of slide rules and their scales. 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. I did a lot of research on them, and when i did, i discovered that there are circular variations. Tims software package allows you to both operate and design your own custom slide rule, a great teaching and learning tool. Circular slide rules also eliminate offscale calculations, because the scales were designed to wrap around.
The pocket protector has been replaced by a cell phone holster. Description of dials of fowlers longscale calculator. Unlike earlier versions of my circular slide rule, i put it far enough towards the outside that i could graduate it for a 20 inch rule instead of as for a 10 inch rule. Abandoned with the advent of handheld calculators, computers. Scales to make a circular slide rule using a cd case.
After seeing phil bs making your own slide rule, i went on a huge slide rule kick. Here derek has put together a number of working slide rules that can be used for calculations and demonstrations on the computer. Generally, they are either have a linear form or that of a circle. One slide rule remaining in daily use around the world is the e6b. The slide rule, also known colloquially in the united states as a slipstick, is a mechanical. Overview of the major categories of slide rules, and descriptions of common scale labels and meanings.
Slide rule for windows is a revolutionary new software it is a single sided slide ruler for windows 3. Faber castell 810 complete set 12,5 cm 5 circular slide rule sleeve. Using a slide rule is a bit of a lost art but with a bit of practice, it can be a useful everyday tool. Next, find the smaller number on the d scale and slide the c scale so the 1 on the far left lines up with the smaller number. 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.
Professionally engineered and custom manufactured by datalizer. Customers tell us that they know circular slide rule style calculators as. 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. Get the best deal for circular slide rule from the largest online selection at. Slide rule circular logarithmic ruler kl1 ussr calculator. Slide rules were used for over 400 years for calculating and estimating. Collection of slide rule replicas slide rules are not manufactured any more. Unfortunately because of the screen resolution, numbers are displayed digitally. This is the third of three backgrounds for the circular slide rule. Scientific american 81 t wo generations ago a standard uniform identi. Scientific american may 2006 university of vermont.
Our next project will include a circular slide rule in the design of the watch. Circular slide rule simulator free downloads 2000 shareware periodically updates software information and pricing of circular slide rule simulator from the publisher, so some information may be slightly outofdate. The slide rule, also known colloquially in the united states as a slipstick, is a mechanical analog computer. If you download the instructions, two of the basic slide rules are also attached. Mar 29, 2019 to use a slide rule to multiply 2 numbers together, move the decimal points for each number you are multiplying so they fall between the values of 1 and 10. 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. Slide rule in fine condition, leather case in very good condition, case does show some age and wear see photos. 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. Slide rule simple english wikipedia, the free encyclopedia. Circular slide rule article about circular slide rule by. Circular and combination slide rule devices erics slide. There are also a couple of slider calculaters from brian and myself.
Includes a slide show of famous and interesting slide rules, most of which are in the authors collection. Given the binary capability of the overlay design, it can indeed be used for accurate multiplication. It replaces the cardboard circular slide rule that just about every natural gas engineer has received from a compressor vendor at some point. 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.
Our original problem was 410 x 9, and we read an answer of 3. The first circular slide rule on this link uses a cd case as the basis for the slide rule. Concise circular slide rules concise typee weights and measures, conversion tables and circular slide rule. Museum of hp calculators slide rule page a very cool page with all sorts of explanations of how sliderules work and pictures of various types, including circular and cylindrical. The slide rule was used for over 400 years as a calculating estimation tool. This is a circular slide rule first created in the 1930s for aircraft pilots to help with dead reckoning. The ones, which still exist, will eventually deteriorate with time. A stiff paper slide rule made from the template in cliff stolls scientific american article. There are a number of sources of manuals for slide rules, they were usually supplied with slide rules when purchased although over the years they have become detached from the slide rule and are now lost.
No matter what youre looking for or where you are in the world, our global marketplace of sellers can help you find unique and affordable options. Oughtred society slide rule seminar a set of slides in pdf form prepared by the oughtred society, covering the history of slide rules and some basics of their use. 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. You may want to check out more software, such as statplus 2007, adding machine or genscn, which might be similar to comphp. The link below will take you to dereks virtual slide rule site. Postscript printer 600 dpi or better with transparency stock scissors a sharp hobby knife or pocket knife thin cardboard the back of an old writing tablet will do white glue and rubber cement if possible. The above is a fun demo design but with modern printers and some craft andor wood making skills, some very fine slide rules can be made, linear and circular models in particular with a range of templates available. The scales are also continuous, so there is no need to make adjustments, such as folded and inverse scales, for results of calculations that go off the ends of the scales. Get the best deals on circular slide rule when you shop the largest online selection at. I particularly like the simulation of the pickett n 525es, a. The slide rule is a simple but elegant mechanical calculator.
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