Description of every hemmi slide rule that did not have a model number. Probability slide rule instruction manual internet archive. Additionally, the slide rule does not tell you where the decimal point is located in the answer. Our new series, tools of the trade, begins with a look at the slide rule. Reading the slide rule scales ia the decimal point d.
Buys and sell slide rules, slide rule repair parts, cases, advice on repairs, etc. The author was managing director of the company that made unique slide rules but as this was a comprehensive range it will be useful for other rules as well. Dividing with the slide rule to divide with a slide rule, you reverse the process you used for multiplication. This presentation stresses slide rule solutions with large and small numbers, n. I taught evening classes in solid state circuit design at our local community college from 1967 to 2000, and during the pre calculator days, around 1974, i assumed my students had a firm grasp on slide rule operation. There is also a version as a word document which is smaller 2040 kb. We know this rule dates to 1922 because of an odd feature. Im happened to meet your website when i searched slide rule. Read the number on the d scale which is just below the 1 on the c scale. I particularly like the simulation of the pickett n 525es, a statistical slide rule and one that is uncommon. The probability slide rule was a highly accurate device for quick and easy numerical evaluation of several important probability functions normal, rayleigh, and maxwell. But in 1922 they started printing matching 6 digit serial numbers on both parts instead.
The instruction manual illustrated features of the slide rule and pointed out some areas of application. We strongly believe every hvac technician should own a supercool slide rule. Line up the 4 on the c sliding scale with the 8 on the d frame scale. 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. 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. The 4058 family of slide rules is of the mannheim type. One slide rule remaining in daily use around the world is the e6b. Unfortunately, i dont have a copy of the revised edition, but even this early work has a lot going for it. Including both superheat and subcooling of r410a and r22. When the same model numbers have been reused for distinctly different slide rules it will be noted at.
If youre a structural engineer, for example, a calculator or computer might tell you that you need a 6. Its the only slide rule on the market that has conversion for smooth metal to insulation lined metal. Slide rule universe take the learn to use and clean them link. Here you will find examples of what was reputably the best range of slide rules ever made. On the reverse side of the slide, the s, l, and t scales appear, and the slide may be re. A history of the logarithmic slide rule and allied instruments.
The cursor travels the full length of the body, and the hairline crosses these scales for direct comparison. Here are two videos with regrettable autofocus hunting explaining the basics of computation with a slide rule. The rule does multiplication, division, square roots, cube roots, common logs, and trig functions. David crates quality slide rules slide rule manuals. Npr ed before the smartphone, the laptop and the pocket calculator, there was a powerful mechanical computer.
Here derek has put together a number of working slide rules that can be used for calculations and demonstrations on the computer. Here is a virtual slide rule which works in your browser. Slide rules were simple to use and accurate enough for most occasions. Ohms law, combined resistances, power calculations, transformer turns ratios, reactancescomplex impedance, periodfrequency, gain caluclations, phase angle, coordinate tranformations, rc circuits, etc. The early 4058s were constructed on a box wood frame with printing on paper. Slide rule precision, accuracy and significant digits. The students slide rule model number 17491 was first shown in 1897 and is the predecessor of the 4058s. Faber castel 283n this rule was one of the most comprehensive produced. This program does not include instructions on how to use a slide rule. Basic slide rule operation for scientists and engineers 10. Thompsons original 1930 slide rule book was also updated in a second 1952 edition the standard manual of the slide rule that many collectors feel is the standard slide rule reference text. Cleaning the slide rule major historical developments in the evolution of the slide rule preface this slide rule has been manufactured after a comprehensive study of the functional requirements involved and forms part of a new range designed for maximum efficiency. Here are two videos with regrettable autofocus hunting explaining the. Description of every numberedmodel slide rule made by hemmi slide rule company of tokyo, hemmi catalogue ii.
Each scale on the slide rule should have a letter or symbol identifying it, printed to the left or right. Any reproduction or modification of these notes for commercial use is prohibited. The regular scales of a slide rule are cyclical in that if you were to extend them, they would basically form a repetitive scale. The slide rule, also known colloquially in the united states as a slipstick, is a mechanical analog computer. Having seen how to do basic multiplication on a slide rule, we can now understand the basic scales on a slide rule, as shown in the first image above. Using the slide rule in electronic technology charles alvarez, 1962, pub. In a separate calculation you find the order of magnitude by combining the powers of 10. So you can get a lot done without multiple log scales.
The a, d, and k scales are on the body, the b, and c scales on the slide. A slide rule will tell you that you need a 65 beam. An outstanding design feature of this range is the introduction of. This is a circular slide rule first created in the 1930s for aircraft pilots to help with dead reckoning.
February 8, 2017 the free iphone beta app has been released and is available for download now at. The slide rule cannot be regarded as a modern invention since the first design dates from the early part of the seventeenth century, but every year sees additions and variations made and the uptodate instrument has, as might be expected, advanced greatly beyond the earlier types. This guide will assume your slide rule uses the most common notation. Capacitors replacing a dual run capacitor with two separate capacitors.
Located on the slide, most calculations are done in conjunction with the fundamental cd scales. An 8 slide rule for example would have a c scale 200 mm long with a first division of 1. Anything smaller and i would find it difficult to estimate the division into tenths without extra tools such as a. The international slide rule museum has a multitude of resources for slide rule fans, including scans of user manuals from a variety of manufacturers. The slide rule the book, written by florian cajori, is the standard work on the early history of the slide rule. All slide rules consist of logarithmic scales that can be moved in relation to each other in order to do basic mathematical calculations. Dividing with the slide rule iowa state university. An attempt is made to show the variants in a given model number with time.
Slide rule cartoons and comics funny pictures from cartoonstock. A key difference between slide rules and calculators is slide rules dont store decimal points. How to calculate the air flow of an air conditioner. A new method for the assessment of acidbase equilibrium disorders article pdf available in minerva anestesiologica 736. 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. A family of slide rules is defined as a group of rules that are simular in design and purpose such as when the same slide rule design is offered in different sizes. I tried your virtual slide rule page, it is very interesting. Capacitors parallel creating a 10 mfd with two 5 mfd capacitors. There is no way of indicating the position of the d. Simpson departmentof physical sciences and engineering princegeorges communitycollege november 29, 2010 1 introduction before electronic calculators became widely available ar ound 1975, students, engineers, and scientistsperformed mathematical calculations using an instrument called a sliderule. To do a calculation with a slide rule you reduce all numbers to scientific notation with 24 digits then use the slide rule to perform the basic operations. Ron manleys slide rule site take the instructions link. Nov 09, 2012 bryan knowlton, inventor and creator of the supercool slide rule, explains how this amazing tool will make your job in air conditioning easier by saving time and money.
Supercool slide rule is a tool to test hvac and air conditioning units. Etsy is the home to thousands of handmade, vintage, and oneofakind products and gifts related to your search. These video tutorials are designed to only be used by properly trained and certified technicians. 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. Slide rule cartoons and comics funny pictures from. The link below will take you to dereks virtual slide rule site. Bissaker slide rule 1654 circular slide rule king pocket calculator 66 sclales thacher calculator 30 ft. All literature is ed and property of supercool slide rule. Mannheim slide rule 1850 faber castell 283n nestler 23r mannheim issac newton put 3 scales in parallel in 1675 to compute cubes. Perhaps in a future release some of those will be added, but instructions are still available online in the form of scanned manuals from physical slide rules, and in various articles published online. Slide rule funny cartoons from cartoonstock directory the worlds largest online collection of cartoons and comics. Most students learned slide rule use on the linear slide rules, and never found reasons to switch.
This is one of the amazing properties of the logarithm. So if the slide rule in the example above was perfectly manufactured, and if our eye can estimate 10 subdivisions inside a 1. The simplest slide rule would have two log scales that you could use to do multiplication and division see my slide rule introduction page for more info. The sterling slide rule has standard a, b, c, c, d, and k scales. I reckon i may be able to estimate 10 subdivisions between 1 and 1. Capacitors adding a superboost or torque multiplier. Capacitors series creating a 5 mfd with two 10 mfd capacitors. All of the authors were listed as associate or assistant professors of mathematics at the us naval academy. Additional scales if you multiply a number by itself, the result will be twice the distance from the index the 1 mark as the original number was. Please remember to disconnect all electrical before servicing any equipment and follow all safety guidelines.
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