# Linear slide rules

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Definition from Wiktionary, the free dictionary. This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. Description Faber-Castell N-front. This file is in the public domain , because the pictured product was manufactured and marketed prior to January 1, outside the United States.

## US2983447A – Slide rule and adding device combination – Google Patents

It has a green leather slip case. The Addiator can be seen on the Addiator page. Inch ruler on upper edge. There are tables on the reverse. It has a black card case. The metric ruler is continued in the well.

A. W. Faber-Castell slide rules were made mainly in Germany (plus Switzerland and Austria), and are some of the most elegant and well designed slide rules.

As Dr. I was the first to open it. Also found on the front are the sine scales S and ST , double tan scales T1 and T2 , and a Pythagorean scale P, which gives the cosine of the angle on S. They can be used to compute square roots, or for multiplication and division with the precision of a inch rule. Like on most Castell rules, the scales are self-documenting, meaning that the scale name appears at the left end of the scale, and its mathematical formula is at the right end.

The instruction manual, in English, was in excellent condition, with just some yellowing of the paper with age no musty smells. Even the box it came in was in pretty good condition, with just a few worn corners and two bent tabs. Not bad for a something year old product. Also included was a plastic reference card, about the same length and width as the slide rule.

## A.W. Faber-Castell: 4/98

As a result of this over-all design style and part number format, there are often very similar Faber-Castell rules which differ only in the body design, and essentially identical rules which differ only in scale length. Some rules also featured ‘addiators’ on the reverse side, to allow addition and subtraction as well as conventional slide rule operations. These combination rules are quite unique, and provided exceptional computing power in an all mechanical design.

Want to know how these addiators worked? This technique was also used by Aristo another German slide rule maker , but they used yellow as their trademark accent to match their packaging. While their first rules until were of ‘swiss pearwood’, there was a brief period where beech and maple were used, after that period they were made of ‘special wood’ a wood composite with laminated scale surfaces.

The standard slide rule used 25 cm (some 10 inch) long scales— the top one The Faber-Castell 2/83N Novo-Duplex upper face—serious firepower on a slide Hemmi used two letter date codes, this one ‘FG’, which allows it to be dated to.

Source: David Riches ‘s Collection. It is complete with mock snakeskin slip case not shown , stylus and instructions and probably dates from the s. The machine front has a rather faded finish. It is an Addimult Addmaster, serial no. It is a virtually exact copy of the pre-war Addiator. It is mounted in a steel case which doubles as a desk stand.

It can be flipped over to access the subtraction side. Here are photos of two Produx Original calculators. I also have the instructions from both – these cover both numerical and sterling calculators so I have two identical copies. They are virtually identical except that one is sterling and the other is decimal. All are views of Addiator serial no M which is a Sterling model dating, I think, from the s. It measures 7.

## More Slide Rules

I bought my first scientific calculator in a Decimo E, ‘Electronic Slide Rule’ and my ‘analogue calculator’ rapidly gathered dust. It was only about two years ago that I renewed a latent interest in them and started to explore the many superb resources available, which prompted me to purchase a selection. I wouldn’t describe myself as a collector, I bought one example each of styles and of makers that particularly interested me and my ‘collection’ has stopped at eleven.

Alro chemie showing atomic masses from j. Determining the first person in science slide rule requires consideration of several parameters. The interesting.

For slide-rule freaks only, a detailed list of my slide-rules. Instructions for using one are here. AW Faber Wooden structure with white plastic facing pinned on. Single-sided with double-sided slide. Two cursors, wooden with plastic window. S, L and T scales can also be read from windows on the back. Scales on the front are unnamed. Made in Bavaria. From the presence of a model number and the solid wood construction, this one is probably from around Thanks to Emrys for this one.

Larger: Front Rear.

## File:Faber Castell 6 inch slide

May 9, w. With such slide rules it is also already known, for example, to provide on one side arrangements yfor higher types of calculations, such as multiplication, division, involution, evolution and the like, Whereas such arrangements for simple types of calculation, such as addition and subtraction, can be arranged on the rear side in the form of slides. It has thereby become possible to fit a small adding device into a normal slide rule Without the slide rule becoming noticeably thicker than the usual slide rules.

Thanks to Mr Trevor Catlow for the artical “Suggestions for dating pre Faber-Castell slide rules” (search it on google) for enabling me to date it so.

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## Faber Castell 52/82 Duplo student’s slide rule

Interested in finding out more out about such calculating wonders? Then try one of the slide rule related articles often light-hearted I have published. Go to the search papers page.

Faber Castell Slide Rule 1/87 Rietz Date Code 52 In Wooden Storage Box. EUR EUR postage. or Best Offer.

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## Slide rule

Alro chemie showing atomic masses from j. Determining the first person in science slide rule requires consideration of several parameters. The interesting questions with case.

It dates from Faber Castell 4/87 Rietz slide rule. This 20” scale length slide rule is pearwood with celluloid facings and a metal framed glass cursor.

The first logarithmic calculating rules did not slide at all This ” Gunter’s Rule ” was the original device introduced by Edmund Gunter in , which remained in use for some two centuries. This idea remained for three centuries at the heart of every slide rule made. This instrument had a variety of useful scales and tables on one side and a standard 2-foot measuring rule on the other. The logarithmic calculating function used the narrow slide in one of its legs For more, see this article.

The variety of calculations required ran into a problem: to calculate multiply or divide or convert between different quantities one needs to move from a number on one scale to the number at the equivalent point on another scale. This required the two scales to touch each other, so the equivalent points could be pinpointed accurately.

## Vintage Slide Rules

From Wikimedia Commons, the free media repository. File information. Structured data.

The iconic slide rule, long identified with the science and engineering (for items pre-dating the 19th century, rarity and price do conspire against the collector!) with decimal point tracker, by A.W. Faber Cursor of a slide rule by Faber Castell.

The slide rule , also known colloquially in the United States as a slipstick , [1] [2] is a mechanical analog computer. The slide rule is used primarily for multiplication and division , and also for functions such as exponents , roots , logarithms , and trigonometry , but typically not for addition or subtraction. Though similar in name and appearance to a standard ruler, the slide rule is not meant to be used for measuring length or drawing straight lines.

Slide rules exist in a diverse range of styles and generally appear in a linear or circular form with a standardized set of graduated markings scales essential to performing mathematical computations. Slide rules manufactured for specialized fields such as aviation or finance typically feature additional scales that aid in calculations particular to those fields. At its simplest, each number to be multiplied is represented by a length on a sliding ruler.

As the rulers each have a logarithmic scale, it is possible to align them to read the sum of the logarithms, and hence calculate the product of the two numbers. The Reverend William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier. Before the advent of the electronic calculator , it was the most commonly used calculation tool in science and engineering.

In its most basic form, the slide rule uses two logarithmic scales to allow rapid multiplication and division of numbers. These common operations can be time-consuming and error-prone when done on paper. More elaborate slide rules allow other calculations, such as square roots , exponentials , logarithms , and trigonometric functions.