Another example of a simple slide rule would be the e6b flight computer. This is circular slide rule calculate a gain, loss or swr when measuring powers or working on antennas. An historical introduction to slide rules from the museum of hp calculators. A large number of templates for circular slide rules are given, along with many other templates. Its usage is identical to that of a real slide rule, but tim has introduced two major enhancements. A brief tutorial on finding the log of a number, useful for db scales. Circular slide rule for sale in uk view 51 bargains. Circular slide rule definition of circular slide rule by. Dozens of scales are included and numerous features that. The concise company of japan still manufactures circular slide rules which can be purchased directly from them or through. Except, the jeppeson e6b flight computers are shown on the back side. This software tries to replicate the slide ruler which was so popular way back than. Unfortunately because of the screen resolution, numbers are displayed digitally.
Vintage circular slide rule miterite taper convers. The appeal of slide rules for use and as collectables. Slide rules circular slide rules national museum of american. Nice surprise with the slide show with slide rules that actually work. Pandahall elite 1pc acrylic slide rule punching positioning calculation ruler stencil template for. Compared to a calculator, a slide rule is severely limited in its accuracy. How to use a circular slide rule caliper timepieces inc. They were finally abandoned with the advent of handheld calculators, computers and smart phones. The slide rule also does not tell you the sign of your result.
Our next project will include a circular slide rule in the design of the watch. Their elegant simplicity is still a thing of wonderment. To someone who doesnt know how to use it, a slide rule looks like a ruler designed by picasso. A slide rule comprised of two thin plastic disks and a cursor, all attached to each other coaxially in a manner that allows them to be rotated. Spheres circular slide rule archive circular slide. Spheres slide rule universe is a repository for information, pictures, history and links to sellers, other sites and experts, and an online store.
After seeing phil bs making your own slide rule, i went on a huge slide rule kick. For example, a 10 cm circular would have a maximum precision approximately equal to a 31. Here you will find a collection of some of the most prominent models carefully handcrafted and simulated or emulated in javascript. The top picture shows the setting for the multiplier 8 in the sum 8 x 6. This is one of concises higher end circular slide rules, made in a special run for the international slide rule discussion group at yahoo in the fall of 2002. Seiko flight chronograph wrist watch for men in gold condition is used. This is a circular slide rule first created in the 1930s for aircraft pilots to help with dead reckoning. Fivescale circular with slide out panel containing a wealth of useful conversion tables and data. Very nice rule, complete with vinyl slip case and manual. The slide rule was used for over 400 years as a calculatingestimation tool. The principle is simple, the powers are on 4 decade logarithmic scales, for a 40 db range. Circular slide rule uncommon fabercastell circular, brand new, mint plastic body rule with rotating scale and 7 line cursor, two color redblack scale markings, trademark mint green accent stripes on primary scales, yellow stripes on dual cycle scales, and expanded trig scales. Slide rules disappeared from the engineering students kit along with socks.
Media in category circular slide rules the following 54 files are in this category, out of 54 total. Includes a brief side show slide show of famous and interesting slide. Over the past few centuries, i am wondering how many scientists, engineers and astronomers using the slide rule to create our modern world. 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. Youll find more information about their current circular slide rule offerings at their website.
First thing youll probably notice is the inclusion of the groups logo in the center of the rule. Slide rules circular slide rules national museum of. The face of the vectormaster permits the rapid solution of problems involving vectors, such as those encountered in current sailing, determination of true wind direction and force, and apparent wind to be. 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. I have used this software to build demonstration sliderules for papers that i have prepared for the international meetings and can highly recommend it. There are at least three different scales, and on most of them the numbers arent even spaced evenly apart. 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. Invented in the 1600s, slide rules were widely used through the 20th century. Authentic gameboy software selling roses from japan no. This page gives my own templates see below for constructing a circular.
Slide rule software sphere researchs slide rule universe. I did a lot of research on them, and when i did, i discovered that there are circular variations. Most students learned slide rule use on the linear slide rules, and did not find reason to switch. May 24, 2016 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. The following was written in 1999 by jason waskiewicz. Their first model was the 120 trainer, introduced in 1964. You can enter and read a number typically to two or three decimal digits only. Circular slide rules also eliminate offscale calculations, because the scales were designed to. A 17% tip in a restaurant is easily calculated by aligning 10 on the inner rule with 17 on the outer rule. 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. Circular slide rule article about circular slide rule by. The first thing youll need to do is design the rule.
The lower picure shows the answer on the leftmost cursor. 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 ones, which still exist, will eventually deteriorate with time. However, this simple construction is also not very durable, and so circular slide rules may get out of position and thus they lack accuracy, compared to. The 120 trainer is a 10 simplex polyphase slide rule with a. My collection of circular and combination slide rule devices. 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. There are places on the internet that have templates for circular rules.
Accuracy, however, is limited and depends on the users skill. This specialpurpose 1950s circular slide rule from remington rand was used by programmers to optimize how the roomsize mainframe executed instructions. Home page abaci addiators circular slide rules pocket watch slide rules. Slide rule for windows is a revolutionary new software it is a single sided slide ruler for windows 3. Pilots are required to be proficient on the e6b slide rule. With the aid of scales printed on the frame it also helps with such. Fowlers magnum long scale calculator made in england circular slide rule. Sophisticated models have more scales than my simple circular slide rule, making for greater flexibility. Circular slide rule drawn with jeanpaul gendners galva software stationary disc movable disc. Circular and combination slide rule devices erics slide.
Nestler radiation cold war circular slide rule strahlenschutz rechenscheibe rl vintage ussr russian radiation dosimetric nuclear circular slide rule logarithmic circular slide rule kl1, vintage 1969 s, soviet ussr, two sides. This circular slide rule provides for the solution of time, speed and distance, fuel consumption, conversions, multiplication, and division. The base of the circular rule is suspended above a central pivot. Includes a brief side show slide show of famous and interesting slide rules, most of which are in the authors collection. Circular slide rule based on my guess concerning nystroms calculator design. Insurance wheel replaces the old circular slide rules. The single slide rule is designed for beginner, consisting of k, a, b, ci, c and d scales only. Circular slide rule watch tutorial my quick guide and tutorial explaining how to use a circular slide rule flight watch. I used it every day for trig functions, logs, regular calculations, etc. All other scales on a slide rule are referenced to the c and d scales. The slide rule, also known colloquially in the united states as a slipstick, is a mechanical. Erics where to buy slide rules page erics slide rule site.
Pandahall elite 1pc acrylic slide rule punching positioning calculation ruler stencil template for leather craft making, 117x86x2mm, hole. Pickett microline 121t 10 polyphase slide rule pictured in thumbnail in the 1960s, pickett began manufacturing lowcost plastic student slide rules under the microline brand name. Though i grow up in the age of digital computer, but i am so impressed by the beauty of mathematics behind this analog device. It is a free, javabased, incredibly precise and configurable scientific slide rule that you. Using a slide rule is a bit of a lost art but with a bit of practice, it can be a useful everyday tool. Insurance wheel is a useful tool for insurance brokers as well as insurance carriers. A compact 80mm3 14 inch pocket circular slide rule, with conversion factors and formulas on rear face. I have used this software to build demonstration sliderules for papers that i have prepared for. 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. Most students learned slide rule use on the linear slide rules, and never found reasons to switch. The front side has a true circular slide rule that has interesting widgets. Circular slide rules slide rules were analog devices in which the number of significant digits were proportional to the size of the rule and the smallest graduations that a typical person could resolve. Two bars, each marked with scales, slide next to each other. Tim has provided a free downloadable software emulation of the sliderule.
Jan 10, 2009 i had a circular slide rule for high school. Aligning numbers on different kinds of scales allows different calculations, such as multiplication or trigonometry. 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. Get the best deals on circular slide rule when you shop the largest online selection at. Go to the pocket slide rules go to the circular slide rules. By wrapping the scales around a circle, the manufacturer could increase the scale length while keeping the overall length modest. Get the best deals on circular slide rule when you shop. The slide rule is still a remarkable instrument, small, light and not requiring batteries or sunlight, and not subject to the laws of decay and disintegration. 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. Yes, there is some interesting slide rule software that allows you to demonstrate and experiment with slide rule. This is a powerful lightweight pocket rule, with performance equal to a much larger straight rule.
Keeping it up with my math helping tools and after i finished my straight cardboard slide rule, i decided to make. May 05, 2016 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. The e6b circular rule scales are used internationally for safe manual calculation of air time, distance, speed, temperature, compass errors, and fuel consumption. The only maker that still produces classic slide rules is the japanese maker concise. Ussr soviet mechanical calculator circular slide rule pocket type with manual. Poor line of position computer circular slide rule retailed by negus description this line of position computer, or mechanical navigator, is essentially a circular slide rule for determining ones location, either from morning or afternoon sightings for longitude or from.
Datalizer wheel chart calculators are designed for quick calculating. Get the best deal for circular slide rule from the largest online selection at. Today planes rely on very different technologies but the rule is still useful whenever you want to do operations without having to type. Make offer very rare antique ross precision computer circular spiral slide rule. You can use these to create any length of slide rule mike. It is a very good example on how the divisions of the slide rule scales are calculated. This program replicates the most common types of slide rules. One slide rule remaining in daily use around the world is the e6b. Slide rulesthe principle behind a slide rule is straightforward. An e6b flight computer commonly used by student pilots.
Slide rules were used for over 400 years for calculating and estimating. The precision and accuracy of a well made slide rule both improve with slide rule scale length. In addition, fabercastell has a number of slide rules still in inventory, available for international purchase through their web store. 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. One of the nice things about circular slide rules is that youll. Concise circular slide rules concise typee weights and measures, conversion tables and circular slide rule. The slide rule was used for over 400 years as a calculating estimation tool. Also because of all the detail, the 30loop spiral slide rule converts to a. Scales c and d, multiplication and division duration.
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. Collection of slide rule replicas slide rules are not manufactured any more. A gift from a retired engineer, this marks my first cylindrical rule, also known as a tubular or helical slide rule. 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. You can also check out my circular and combination slide rules page for some examples. 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. Circular slide rule synonyms, circular slide rule pronunciation, circular slide rule translation, english dictionary definition of circular slide rule. See the page devoted to the watch style of slide rule at the international slide rule museum. Slide rules usually look like a narrow ruler, but for todays demonstration we will be building a circular slide rule.