The l scale gives the logarithm of a number on the d scale. Slide rule two page how to there is 1 adobe pdf file in 1 zip file. Your coumadin dosage will be determined by a blood test, whose result is given as an inr. This video explains the ci scale and its basic uses.
Sphere researchs slide rule universe, build your own slide. Has a slightly magnifying 4 line cursor, side cm ruler, back cursor for the trig scales, and leather case. After the problem is complete, well move the decimal point in the answer back to the right place, as described at the end of this section. Original aristo catalog page for these rules 1969 slide rule. Bissaker slide rule 1654 circular slide rule king pocket calculator 66 sclales thacher calculator 30 ft. Cdf, pix, the folded scales, cf on the slide, df on the body. This is done about four times a day every five to six hours, or before meals and at bedtime. Ci1st number to multiply, goes over top d2nd number to multiply. It is well known to any slide rule enthusiast that there are many restrictions on the ranges of the numbers that can be entered and manipulated on the various scales of a slide rule. The leaflet also contains an illustration of reading graduations on the scales, an explanation of hemmis construction techniques, and various technical problems that could be solved with slide rules. Additionally, the slide rule does not tell you where the decimal point is located in the answer. They are briefly described here, for more information see table 1 on the slide rule page. Line up the 4 on the c sliding scale with the 8 on the d frame scale.
It is the purpose of this manual to explain the operation in. 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. Click on a title to jump down to the document detail and pdf. The a scale is just twice the d scale on the same printed on the same length of the slide rule as the d scale. Both slide rule and tachymeter watches use nonlinear scales. Instructions for using the coumadin warfarin slide rule for. If you download the instructions, two of the basic slide rules are also attached. The slide rule is only labeled with numbers between 1 and 10. As many of you know, watches with slide rule functions have 2 logarithmic scales the outer of which turns.
It is a very good example on how the divisions of the slide rule scales are calculated. The ll01, ll02 and ll03 scales are for arguments between 0 and 1. Scales are generally labeled with one or twoletters, and these names are standard onmost rules. Multiplying with the slide rule suppose you want to multiply 2x4. So the space from 1 to 10 is the same as the space from 10 to 100, and so on. 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 oughtred society was founded in 1991 by a group of slide rule collectors and is dedicated to the preservation and history of slide rules and other calculating instruments. Instructions for using a slide rule project gutenberg. Right now i am talking with a friend who studied electronics just a couple of years after electronic calculators unceremoniously drove slide rules from the engineering scene. By the time i finished engineering school in 1963, the slide rule was a well worn tool of my. Also, the creator of the universal slide rule league a lunchtime 5minute competition of. In contrast, a tachymeter scale is hyperbolic and typically has numbers that run in from infinity down to sixty.
The early and high end slide rule wristwatches, such as the juvenia and breitling also showed the same manufacturing accuracy. Multiplying with the slide rule iowa state university. There is also a version as a word document which is smaller 2040 kb. Located on the slide, most calculations are done in conjunction with the fundamental cd scales. It is unfortunate that, for some reasons not easy to see, the slide rule is sometimes regarded as a difficult instrument with which to become proficient. Concrete estimator slide ruler 200 yard volume calculator. Typical slide rules contain scales for multiplying, dividing, and extracting square roots, and some also contain scales for calculating trigonometric functions and logarithms. Oughtred society slide rule reference manual the oughtred. New listing 1956 engineering slide rule post versalog no. There are sections for hemmi normal slide rules, the electro slide rule with log log scale, and the improved slide rule. A green entry means the scale is on the slide, a black it is on the body.
Slide rule, a device consisting of graduated scales capable of relative movement, by means of which simple calculations may be carried out mechanically. In most sliding scale insulin therapy regimens, your blood sugar is taken using a glucometer. Npr ed before the smartphone, the laptop and the pocket calculator, there was a. Dividing with the slide rule iowa state university. A duplex slide rule had scales on both sides, the usual case for engineering slide rules. Rules with color highlighted scales wooden slide rules slide rule literature see end of this guide for a starter list of specific slide popular with rules, with photos, that are collectors. A standard manual for circular slide rules, direct from concise in the fall, 2002. You can use these to create any length of slide rule mike. The c scales index will point to the answer on the d scale.
One rule provides an a scale and a b scale which slide against each other, and another has two k scales, which can be used in exactly the same way. Instructions for sterling precision slide rule national. The ll1, ll2 and ll3 scales are for arguments greater than 1. A history of the logarithmic slide rule and allied instruments. The value is always found on the d scale, with the order of magnitude mentally set.
The logarithmic slide rule is a compact device for rapidly performing calculations with limited accuracy. But wait, if you order now youll get the slide rule for cello scales at the same lowcost. Slide rule wristwatches trigonometric functions watch. This report, an update of a paper on long scale slide rules published by the oughtred society 11, was. In 1950, post brought out an american version of the bamboo slide rule manufactured by hemmi of japan, the versalog. Manufacturers of quality school supplies 1140 commerce avenue, union, new jersey. Aug 03, 2016 cliff stoll shows off an electricpowered slide rule. Scales are generally labeled with one or two letters, and these names are standard on most rules. On a log scale, the spacing between each multiple of 10 is equal, while the spacing between individual numbers changes along the rule. The slide rule the book, written by florian cajori, is the standard work on the early history of the slide rule. To multiply two numbers on a typical slide rule, the user set the left index start of the scale on the c scale to line up with one factor on the d scale. The construction is bamboo, a wonderfully stable, mildly lubricious material.
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. This is a fun quickreference, but you really should know your circle of fifths. Move the decimal point in each number you are multiplying, so they fall between these values. With a bit of practice, you may be surprised at its ease of use and its utility. This set is unused and immaculate the box is a little worn. The instructions cover multiplication and division, the ci scale which is called the c 1 scale, squares the a and b scales and square roots, and the k, l, s, and t scales. For all other notes, l ocate them on the grey scale and read off the transposed key note on the white slide. Instructions for using the coumadin warfarin slide rule for target inr 2. Scales to make a circular slide rule using a cd case by ying hum va3yh canada there are 2 circular slide rule options shown. The scale on figure 1 is called r scale on hoffmans digital slide rule 1. Slide the rule so that 16 on the d scale lines up with 3 on the c scale. This guide will assume your slide rule uses the most common notation.
O when adjusting the cursor, or flipping the slide rule over for scales on the opposite. Scales may be split into two or more subscales and it is up to you to figure out which is relevant for a particular calculation. The maximum resolution of a slide rule is only 24 digits depending on which end of the scale is being read. Scientific american may 2006 university of vermont. X list of 24 common slide rule scales and their functions. It is a simple manual, but very adequate and covers the scales on both the virtual slide rule linked above and the pdf slide rule i built. This slide rule is a genuine classic and deservedly so, with one of the best scale layouts ever devised for professional technical work. This kind of loglog scale was actually used on some of the earliest slide rules with loglog scales. Ron manleys slide rule site take the instructions link. Scale labels were not completely uniform between brands. Since this kind of scale can be intimidating, the model a rule includes the ll scale, which works in conjunction with the k scale instead of the c or d scale. Stadia or tachymetrical slide rules august 2005 5 the cos2 scale and the s scale are organised in the same way as the nestler above, but here in combination with the lower d scale. Line up the 1 on the left hand side of sliding scale c with 2 on frame scale d.
The scale may run the length of the rule c scale or may be repeated several times a and k scales as seen on your slide rule. Npr ed before the smartphone, the laptop and the pocket calculator, there was a powerful mechanical computer. 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. Here i cover the most basic operations of a slide rule. Read the number on the d scale which is just below the 1 on the c scale.
Stadia or tachymetrical slide rules rechenschieber. Squares, square roots, cube and cube roots, maybe evaluated easily with the aid of the loglog scales, often with a higher degree of accuracy than can be attained with the p and q scales. Dividing with the slide rule to divide with a slide rule, you reverse the process you used for multiplication. Logarithms were discovered by john napier 1550 1617. The university of chicago pickett the worlds most accurate slide rules. Slide the grey scale until the original key note coincides with the transposed key note on the white s cale. The following was written in 1999 by jason waskiewicz. The slide rule and other instruments which give the same facilities for rapid calculations, are covered by the term mechanical calculation. For example, 8 ll scales usually means 8 distinct scales, 2 c scales usually means there is a c scale on each side of the slide rule. The slide rule was strong in conversions with a constant factor. May 18, 2016 the second of a series of videos explaining the basic slide rule.
Cd, x, the c and d scales, c on the slide, d on the body. The slide rule made its first appearance in the late 17 th century. The invention of logarithms in 1614 by the scottish mathematician john napier and the computation and publication of tables of logarithms made it possible to effect multiplication and division by the simpler operations of addition and subtraction. To do a calculation with a slide rule you reduce all numbers to scientific. Over the past three decades it has evolved to an international organization with members in 20 countries. May 01, 2020 this slide rule has a logarithmic scale.
You can do addition by multiplying and dividing on the kids rule. Please read the coumadin instruction booklet several times before reading these slide rule instructions. The c scale s index will point to the answer on the d scale. There are many factors which can affect a slide rules value. The coarse resolution of the diagram above, and its small scale, shows the mark for 1. Cdi, 1x, inverted scales, the ci scale on the slide, di on the body. Since you used the 1 at the left hand side of the scale, the product is between 1 and 10. Theres also an additional frontandback scan of a separate sheet for the trig scales on the model 300.
Constructing and understanding new and old scales on slide rules. Sphere researchs slide rule universe, build your own. Constructing and understanding new and old scales on slide. On the sterling slide rule, the a scale is on the upper part of the. Angle divisions were originally in minutes, but decimal divisions gradually became predominant, in decitrig slide rules. Most slide rules inidicate the associated order of magnitude next to each ll scale. Mar 29, 2019 each scale on the slide rule should have a letter or symbol identifying it, printed to the left or right. Each just needs to be cutout and placed onto a cd case.