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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. Complete with green and clear plastic case. Made in More photos can be seen on the Addiator page.

Slide Rule

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.

Making examples from published templates is also fun.

Under the slide is also stamped: I. MOLELLA. Date codes on the back appear to read 53 and 1. The brown leather case is marked: FABER- (/) CASTELL.

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.

US2983447A – Slide rule and adding device combination – Google Patents

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.

Following the advice, I went to the student stationery shop and bought the best I could afford, a Faber Castell. This instrument could multiply, divide, perform.

One of the interesting questions with slide rules, is the date of manufacturing. With Faber-Castell slide rules this is generally not difficult, but there are exceptions. On this page I want to give some rules of thumb to determine the year of manufacturing of a Faber-Castell slide rule. Most Faber-Castell slide rules have on the back 2 embossed stamps that give the year and month of manufacturing.

Mostly the left number gives the year, the right number the month. All slide rules with a 3-digit type number starting with a 3 like or were manufactured before

Faber-Castell 6787 Rietz Simplex Slide Rule

From Wikimedia Commons, the free media repository. File information. Structured data. Captions English Add a one-line explanation of what this file represents.

ground rules for successful cus- establishment date. ties of slide rules worldwide. The knights theme dates back to pencil as we know it today dates​.

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. Part of unusual limited series made from high pressure laminated HPL wood with metal inserts – patent no. Slide chart designed as planisphere by Dutchman R.

Harling – upside-down scales on the slide probably a design feature when inverting the slide – read more Seg Ly. Serial no. Little known French maker Drancy, Paris – plastic models similar but forerunners to Graphoplex – unusual wide body – top LL scale not standard for Rietz giving a somewhat unconventional scale layout. Robust military grade OEM for J.

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.

Date, Bids, Price ($), Text. Mar, 5, , GERMAN FABER CASTELL 1/​98 ELECTRO SLIDE RULE CALCULATOR CALCULATING RULER w/CASE.

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Faber Castell 52/82 Duplo student’s slide rule

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.

Now there are several constructional possibilities for putting the invention into practice. Thus it is possible for the ribs forming the grooves to be joined to a thin plate, for example, of plastic, metal, e. Furthermore it is possible in slide rules which are injection moulded from a hardenablesynthetic substance, to form these ribs Wholly of synthetic substance in one working operation with the slide rule.

Over the 19th and much of the 20th centuries the slide rule was the primary instrument for calculation used by many people engaged in the trades and in.

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Slide rule

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.

VINTAGE A.W. FABER-CASTELL ENGINEERING C TRIANGLE RULER, MADE IN GERMANY. AU $ + AU $ shipping. RARE – THORNTON.

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Next Continue. Over the 19th and much of the 20th centuries the slide rule was the primary instrument for calculation used by many people engaged in the trades and in engineering. Although originally invented in the 17th century, and widely used for gauging or estimating the quantities of certain products such as alcoholic spirits it took until around for the slide rule to become generally popular with those for whom mathematics was a daily task.

His scales were the “C” and “D” scales, ranging from 1 the index to 10 and used for multiplication and division, and the “A” and “B” scales, ranging from 1 the index to and used for squares and square roots.

A.W. Faber-Castell: 4/98

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.

While the trig scales on the reverse of the slide are labelled in the standard way (In Faber Castell started marking the date on their rules as the year after.

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. Later Faber-Castell rules were generally made of an engineering plastic called Geroplast appears to be a type of PVC or Cycolac , with deeply embossed and filled scales.

Geroplast and the pigment used to fill the scales sometimes ‘bled’, resulting in a colored bloom around scale markings, or faded accent stripes if left out in sunlight. Most later rules were ‘self-documenting’, and had their mathematical relationships symbolically noted on the right hand side of each scale. Here’s what the catalog has to say about the various types of construction. Compared to most North American rules, they are far more complex and have much nicer user features, including over-range scale extensions to reduce re-setting reached below 1, usually to.

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