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# Topic: Slide rule

 Slide Rule Bicycle Gear Calculation The slide rule was invented back in 1625 by William Oughtred, based on John Napier's 1614 discovery of logarithms. Most folks know that a slide rule can be used for multiplication and division, but a less familiar operation is actually more useful for bicycle gear calculations, the "proportion" operation. Move your mouse cursor over the slide rule image to move the slide rule's cursor, revealing different gear combinations and gear measurement systems that all use the same slider position. www.sheldonbrown.com /sliderule.html   (623 words)

 Slide Rule   (Site not responding. Last check: 2007-11-07) This rule is in force for any runner at any base where the ball is in the glove (in possession) of the fielder and he is attempting to make a tag. One slide rule remaining in daily use around the world is the E6B. This is a circular slide rule first created in the 1930s for aircraft pilots to help with dead reckoning. www.lycos.com /info/slide-rule.html   (548 words)

 Slide Rule Until about 1980, the engineering student could be recognized by the slide rule case dangling from his or her belt, in addition to the pocket protector, beanie and white socks. 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. Move the slide until the divisor on the C scale is under the cursor, and read the quotient on the D scale at whichever end of the C scale is on the D scale. www.du.edu /~jcalvert/tech/slidrul.htm   (2326 words)

 Oughtred Society Slide Rule History.   (Site not responding. Last check: 2007-11-07) The slide rule's importance to the Industrial Revolution, and the impact of the Industrial Revolution upon the slide rule, are demonstrated by the proliferation of designs. A revolutionary linear slide rule construction with scales on both front and back and with a cursor referring to all scales simultaneously is patented in 1891 by William Cox … an invention he calls the "duplex slide rule". Slide rule researchers have estimated that possibly 40 million slide rules were produced in the world in the 20th century alone. www.oughtred.org /history-new.shtml   (1453 words)

 Moonstick Information Site - slide rule moon phase calendar A moonstick is a slide rule moon phase calendar. Unlike a conventional slide rule, its rulers are bundled together in a hexagonal profile and held together by two rigid hexagonal straps (permanently fixed to a particular ruler). A slide rule computer provides a durable, understandable alternative to an electronic computer. www.moonstick.com   (753 words)

 Eric's Introduction to the Slide Rule page The words "slide rule" may conjure up images of overwhelming complexity and technical detail for you, but the underlying concept is actually quite straightforward. As such, Oughtred is generally considered to be the inventor of the slide rule, although there has been considerable debate as to when exactly he came up with his invention (it was probably within a few years of Gunter's original line). The modern slide rule can be traced back most directly to Amédée Mannheim, who developed the basic 10 inch design and scale arrangement in 1850 while a student in Paris (he eventually became a Colonel in the French artillery and a Professor of Geometry). www.sliderule.ca /intro.htm   (3135 words)

 2.972 How A Slide Rule Works Before the slide rule, the product of two numbers were found by looking up their respective logs and adding them together, then finding the number whose log is the sum, also called the inverse log. The slide rule made it easier to utilize the log relations by developing a number line on which the displacement of the numbers were proportional to their logs. Slide rules are rarely used because of the advent of electronic calculators and computers. web.mit.edu /2.972/www/reports/slide_rule/slide_rule.html   (1029 words)

 Tactical nuclear slide rule - Patent 4308449 The slide rule portions further include several scales, which may be engraved or printed on the slide and the stationary part, the scales having particular relationships as described in the sequel. The individual scales on the present slide rule are selected to provide the particular coefficients shown in the preceding equation, and further to provide for the proper relationship between weapon yield and distance. That is, scale 46 and 48 and the entries thereon are utilized in a manner similar to the use of scales "c" and "d" of an ordinary slide rule and the ratio determined thereby. www.freepatentsonline.com /4308449.html   (3201 words)

 [No title] The scales on a slide rule are logarithmic, in that the spacing between divisions (the lines on the scale) become closer together as the value increases. Slide the rightmost Index '1' on the C scale to the cursor hairline. Slide the leftmost '1' on the C scale to the cursor. www.sliderulemuseum.com /SR_Course.htm   (4307 words)

 Slide Rule The basic slide rule is suitable for multiplication and division, but not for addition and subtraction, which is the purpose of the "Addiator" on the other side of this unusual model. A slide rule has scales both on the fixed body and also on the sliding middle section, while s sliding cursor is a useful aid in determining the alignment of the scales. One disadvantage is that the slide rule is oblivious to the placing of the decimal point, which has to be determined separately, often by a quick mental approximation to the answer. www.vintagecalculators.com /html/slide_rule.html   (369 words)

 Slide_rule   (Site not responding. Last check: 2007-11-07) Today, to know the principle of a slide rule might be still usuful for young people to understand the nature of logarithm. A slide rule consists of the rule, the slide, and the cursor. The subtraction of log 3 from log 6 is carried out on the slide rule as subtraction of the segment length of log 3 from that of log 6. www.ies.co.jp /math/java/misc/slide_rule/slide_rule.html   (440 words)

 Technology: Slide rule clings to life in the Internet Age [Free Republic] Slide rules are even tugging the heartstrings of a handful of folks who had scarcely learned to count by the time the devices began their precipitous decline. Using a slide rule developed a mental discipline, as the location of the decimal point had to be kept in the head. The slide rule was used almost exclusively in the design of everything built to put man on the moon, and most everything designed up through the '70s (at least!) was designed with slide rules. www.freerepublic.com /forum/a3b45097118bb.htm   (3842 words)

 NFHS Forum: Force play slide rule The runner should be starting their slide at such a time as to be stopped at the bag. Rule 6.09(b) Comment: A batter who does not realize his situation on a third strike not caught, and who is not in the process of running to first base, shall be declared out once he leaves the dirt circle surrounding home plate. But based on the rule change quoted above, there is no way the rule allows you to call a runner out, even with contact or altering the throw, if he slides legally and directly to (and past) the bag. www.nfhs.org /cgi-bin/ultimatebb.cgi?ubb=print_topic;f=10;t=000827   (840 words)

 Open Directory - Recreation: Antiques: Medical and Scientific: Slide Rules   (Site not responding. Last check: 2007-11-07) The Death of the Slide Rule - Hyperlinked essay with citations by James Redin covering the rise of the portable calculator and the demise of its predecessor. Slide Rule Museum - Dedicated to engineers past and present, this collection of slide rules and manuals have in excess of 1000 different items scanned full size and categorized by company or continent. Slide Rules - Dedicated to one man's collection of slide rules (and includes a photo gallery), plus a few links for those who want to find out more about them or where to buy one. dmoz.org /Recreation/Antiques/Medical_and_Scientific/Slide_Rules   (730 words)

 Slide Rules By the late 17th century, the slide rule was a common instrument with many variations. Some slide rule manuals contain relatively exhaustive explanations of the theory underlying the operations. The single sided rule similar to a Polyphase but with and inverted A scale (typically labeled R) instead of an inverted C scale (CI). www.hpmuseum.org /sliderul.htm   (669 words)

 The Dead media Project:Working Notes:17.3 Source(s): *K&E Slide Rules, A Self Instruction Manual* by Lyman M. Kells, Ph.D., Professor Emeritus of Mathematics, Willis F. Kern, Former Associate Professor of Mathematics, and James R. Bland, Professor of Mathematics, All at the United States Naval Academy. "Since logarithms are the foundation on which the slide rule is built, the history of the slide rule rightly begins with John Napier of Merchiston, Scotland, the inventor of logarithms. Rules have likewise been made specially for chemistry, surveying, artillery ranging, steam and internal combustion engineering, hydraulics, reinforced concrete work, air conditioning, radio and other special fields. www.deadmedia.org /notes/17/173.html   (455 words)

 Konfabulator - Gallery - Slide Rule I've used a slide rule since the 6th grade and as a technician. It would be better if the "Change Rule" button had a popup menu, so that you could go directly to a particular rule. In the "Advantages Of Slide Rule Part 2" pane, the multiplication sign is displaying as a lozenge, probably due to the encoding of js files not being in accord with the encoding declared in the xml file. www.widgetgallery.com /view.php?widget=40705   (550 words)

 Slide Rule Operations The number of different scales, their length, and the number of subdivisions are largely determined by the size of the slide rule. For this equation, M is the length of the rule (10 inches), and d is the distance between 1 and n on the rule. Although collecting slide rules is not really a hobby, I have kept my eyes open through the years and now have examples of most of the slide rules that were used in an educational setting. www.howe.k12.ok.us /~jimaskew/rules.htm   (2309 words)

 Good Math, Bad Math : Manual Calculation: Using a Slide Rule (part 1) I know a lot of people think that the idea of learning to use something like a slide rule is insane in an age of computers and calculators, and that this is a silly thing to post about. Also, in general, the slide rule is used for the "hard stuff"; multiplication and division, logarithms, exponents, and trigonometry. The slide rule places numbers onto a ruler on a logarithmic scale; so the distance from "1" to a number "n" on the rule is the logarithm of "n". www.scienceblogs.com /goodmath/2006/09/manual_calculation_using_a_sli_1.php   (2512 words)

 Untitled Document As the manufacturer of most of the Post rules, Hemmi is the most familiar Asian slide rule maker to those of us in the U.S. Hemmi also sold rules under its own name and others (Hughes-Owens in Canada, for instance). The Otis King Calculators are long-scale slide rules in which the scale has been wrapped in a spiral around a cylinder. Pickett rules are distinctive for their metal construction, as opposed to the traditional wood or bamboo cores used by most other makers. www.toddtolhurst.com /sliderules/index.html   (760 words)

 Dave's Slide Rule Gallery While all slide rules are reminders of a time gone past, things like listing wavelengths in feet and frequencies in Megacycles (rather than Megahertz) further place this rule in the past. Acquired as part of the "Walker Collection," a batch of slide rules I got all at once when my appearance in the newspaper caused a woman to recall her husband's slide rule collection and decide that I might appreciate it. I got a bunch of rules from a man near town in the wake of being in the newspaper, and three of this rule came as part of the deal. www.eyrie.org /~dvandom/slide/slidegallery.html   (2571 words)

 Slide Rule - TeacherVision.com A slide rule is a mechanical device that uses the alignment of numeric values marked on sliding scales to perform mathematical calculations. Simpler slide rules have two duplicate scales that can be manipulated to multiply and divide, while more complex models have additional scales that allow for finding reciprocals, square and cube roots, and trigonometric ratios. Compared with present-day calculating devices, the slide rule seems limiting, but it is important to remember that this tool was the main method of math calculation for almost 400 years, and a successful one at that. www.teachervision.fen.com /mathematics/math-instruments/5995.html   (824 words)

 Wired News: Slide Rule Still Rules   (Site not responding. Last check: 2007-11-07) While Miles and Alleman are quick to praise the ease of calculators, both said that slide rules not only help with computational problems, they also enabled people to really understand math. And while a few cling to and even still use their slide rules, most people simply prefer to collect them. There are currently over 350 active Oughtred members who meet twice a year to show off their latest acquisitions and engage in spirited slide rule swaps and auctions. www.wired.com /news/culture/0,1284,64846-2,00.html?tw=wn_story_page_ne   (631 words)

 Eric's Slide Rule Site Overview of the major categories of slide rules, and descriptions of common scale labels and meanings. The slide rule's form and features were revised for centuries, and there are probably few people today over the age of 50 who didn't routinely use one in school or at work at some point in their lives. They are an international organization dedicated to the history and collection of slide rules and related calculating devices. www.sliderule.ca   (675 words)

 "The Slide Rule" : Articles : HEARTLIGHT® Magazine The seven-year-old was very proud as he was able to read the sign with all the rules to his brother. Some of you younger readers will be asking, “What’s a slide rule?” I have to admit, I often used one in college rather than a calculator (primarily because it cost over \$100 to get a calculator that would do logarithms!). Numbers are the same, whether they are calculated on a slide rule or a scientific calculator. www.heartlight.org /articles/200110/20011009_slide.html   (563 words)

 yourDictionary Agora language and word forum - Print Page The forerunner to computer screen pointers was the cursor of the slide rule, itself an analog ancestor to the PC. Doesn't seem that long ago, life without a slide rule was impossible to imagine. Best thing about the slide rule, apart from the fact that it rarely broke down if one refrained from slugging anybody with it, was that it was so easy to understand how it worked. www.yourdictionary.com /cgi-bin/agora/agora.cgi?board=wordsuggest;action=print;num=1048207127   (521 words)

 Sphere Research's Slide Rule Universe - New Slide Rule Cases In keeping with slide rule traditions, we used a classic, time honored design technique (CAD guys, eat your heart out - pencil and paper) which allowed us to quickly go from concept to cases in just a few weeks with the help of Seamcraft. Because these rules may be an inch to an inch and a half shorter, a small pad inserted into the bottom of the case gives an easier fit for quick removal. CLICK HERE to send her an order, it is possible to get minor size changes made for your specific rule, although this basic design fits most popular pocket rules. www.sphere.bc.ca /test/cases.html   (1170 words)

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