Spheres slide rule universe is a repository for information, pictures, history and links to sellers, other sites and. Background on logarithms, history of the slide rule, and how it all works. This is the second of three possible backgrounds for the circular slide rule. After seeing phil bs making your own slide rule, i went on a huge slide rule kick. Fivescale circular with slide out panel containing a wealth of useful conversion tables and data. The single slide rule is designed for beginner, consisting of k, a, b, ci, c and d scales only. Circular slide rule instructions tools and materials. Pickett n904t trig and decimal keeper speed rule pickett n525es statrule pickett n4es vectortype log log dual base speed rule pickett 160es microline pickett n600es log log speed rule if youre not sure about how to use a slide rule, take a look at slide rule calculations by example opens in new window. Customers tell us that they know circular slide rule style calculators as. Breitling still makes an array of excellent flight watches. Leipala with images oughtred society slide rule home page.
Old pilots watches feature these slide rules, and any newer pilotstyle watches also have this. Slide rules usually look like a narrow ruler, but for todays demonstration we will be building a circular slide rule. The purpose is to study russiansoviet cylindrical and circular slide rules made before 1940. Old pilots watches feature these slide rules, and any newer pilotstyle watches also have this feature to give the watch a traditional.
Sphere researchs slide rule universe, build your own slide. I particularly like the simulation of the pickett n 525es, a statistical slide rule and one that is uncommon. Very useful for travel, just set the exchange rate. Sphere researchs slide rule universe, build your own slide rules. This is a circular slide rule first created in the 1930s for aircraft pilots to help with dead reckoning. Read both the multipliers and the results on the linear scales on the cursors not on the spiral.
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. Today planes rely on very different technologies but the rule is still useful whenever you want to do operations without having to type. Download the slide rule sheet and print it on a a4 paper. Circular slide rule calculators wheel chart calculators. 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. Many pilots watches made make use of a circular slide rule on the bezel of the watch.
A fairly standard rule and useful as a guide for many other rules. Resources concise 270 circular slide rule smithsonian. The slide portion of the circular slide rule side also includes quickreference material. Just line up the two numbers to get quickly tabs on all their multiples. A large number of templates for circular slide rules are given, along with many other templates. This one features a logarithmic scale for multiplication that makes five turns around the rule. Concise circular slide rules concise typee weights and measures, conversion tables and circular slide rule. The slide rule, also known colloquially in the united states as a slipstick, is a mechanical analog computer. Apr 02, 2014 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. This program replicates the most common types of slide rules. 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. Keeping it up with my math helping tools and after i finished my straight cardboard slide rule, i decided to make another slide rule but of much easier and fast construction. This site hosts a portable package of derek ross, stefan vorkoetters, and brian bartholomews virtual slide rules browserhosted slide rule simulators. An e6b flight computer commonly used by student pilots.
To multiply two numbers and, slide the inside scale so that the 1 on it is over on the outside scale. Conray radiological tables and circular slide rule. 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. The cursors are marked on the glass faces which can also be rotated. The following link will download a word document version. Computing instruments halden calculex circular slide rule. One slide rule remaining in daily use around the world is the e6b. Mine is complete with leather wallet and a copy of revised rules, tables and formulae for patent circular slide rule halden calculex a 94 page booklet which is.
This one is for a generalpurpose rule, except that hyperbolic functions are present, and loglog scales omitted. This side of your computer simply consists of a rotating disk with numbers on the middle scale. The original type of slide rule, a bit harder to find, but also used in enough specialty purposes that some still exist in actual use. Delamain constructed the first circular slide rule. Simply grab the slide or cursor with the mouse to manipulate the rule. 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.
One of the nice things about circular slide rules is that youll. 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 front base has l and d scales, with c, ci, a, and k scales on a sliding disc that fits inside the base. The top picture shows the setting for the multiplier 8 in the sum 8 x 6. Here you will find a collection of some of the most prominent models carefully handcrafted and simulated or emulated in javascript. 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. These were used by pilots to do simple arithmetic, conversions and other calculations in an era before gps and calculators. Updated november 3, 2001 types of slide rules and their scales. Slide rules that are round offer the length of a 10 rectangular slide rule in a pocketsized roughly 3.
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. My criteria are idiosyncratic, naturally, but any slide rule that i felt didnt fit into any other category goes here. Get the best deal for circular slide rule from the largest online selection at. The slide rule is a simple but elegant mechanical calculator. The first circular slide rule on this link uses a cd case as the basis for the slide rule. Here derek has put together a number of working slide rules that can be used for calculations and demonstrations on the computer. Circular slide rule wolfram demonstrations project. I did a lot of research on them, and when i did, i discovered that there are circular variations. Instruction booklet that came with the conray radiological tables and circular slide rule. Overview of the major categories of slide rules, and descriptions of common scale labels and meanings. To be downloaded, in original size, and printed in 200 dpi. 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.
There are also a couple of slider calculaters from brian and myself. Below you will find a postscript template and instructions for building your own pocketsized circular slide rule, like the one pictured at left. 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. Description of dials of fowlers longscale calculator. Slide rule software sphere researchs slide rule universe. These operations are made mechanical by moving circular scales with logarithmic distances marked on them, which can added or subtracted from one another.
If you take a circular slide rule thats only three inches in diameter, then basically because of the circumference of multiplying the diameter times pi to get the actual linear length, it ends up you get the equivalent of a 12inch long slide rule and yet you can stick it in your pocket. 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. Make your own circular slide rule to be downloaded, in ori flickr. The ones, which still exist, will eventually deteriorate with time.
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. Sphere researchs slide rule universe, build your own. Slide rules were used for over 400 years for calculating and estimating. Circular slide rule watch tutorial my quick guide and tutorial explaining how to use a circular slide rule flight watch my seiko flight master. The link below will take you to dereks virtual slide rule site. 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. It was built in the older style with an inch slide rule on the slanted top edge. 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. Teaches basic movements and settings, and looks quite realistic. Our next project will include a circular slide rule in the design of the watch. This circular slide rule is used for a quick lowerprecision estimate of the answer 4 digits precision. Vintage logarithmic slide rule circular aviation calculator ussr rare. To download a zip version for apple macintosh and linux systems.
Concise 270 circular slide rule description this pocketsized white plastic duplex circular slide rule has a clear plastic indicator that folds over the edge to serve both sides. The first of three templates to build a circular slide rule background. Slide rule circular logarithmic ruler kl1 ussr calculator. Free shipping on many items browse your favorite brands. The lower picure shows the answer on the leftmost cursor. Circular slide rule based on my guess concerning nystroms calculator design. Here is the first of three templates for circular slide rule backgrounds.
As these are quite rare, this is a literature study. Faber castell 810 complete set 12,5 cm 5 circular slide rule sleeve. 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. 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. The radiological tables and circular slide rule were compiled and designed to provide a compact calculator and reference source to aid the radiologist or radiation therapist in his or her daily duties. 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. Circular slide rule article about circular slide rule by. Two additional sheets of clear plastic film were cut to the diameter of the spiral, scored with a pin to make a very thin marker line from the centre to the edge, and pinned over the laminated printout to become the equivalent of the two. Haldens calculex circular slide rule, double sided, the inner disc is rotated by the thumb nut in the centre. 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. Collection of slide rule replicas slide rules are not manufactured any more.