Instruction for Castell Precision Slide Rules

Faber Castell Slide Rules Faber Castell rules were manufactured predominantly in Germany, and they were clearly the dominant European slide rule maker. Faber rules are considered by many slide rule enthusiasts as among the best ever made. They sold a wide range of models, with many of their early offerings made of Swiss pearwood or boxwood with celluloid facings. Later rules were made out of Geroplast their name for plastic and featured some of the most useful and advanced features ever seen on slide rules. Always the innovator, Faber was often copied but rarely duplicated by other manufacturers. Many of their rules have survived very well to this day, and remain among the most sought after by collectors. It is also a “self-documenting” rule, as each scale has an example on the far right of what the scale represents and how to use it. You might want to compare this rule to the high end Aristo and Nestler offerings in my collection.

Slide Rule Precision, Accuracy and Significant Digits

How accurate is a slide rule? What’s the difference between accuracy and precision? Precision and accuracy are not the same thing. Very roughly, precision is how many significant digits you can read off the scale, and accuracy is how close your result is to the true result.

– First Faber slide rules appear made of Boxwood. – Adds celluloid facings to Boxwood body and slides – Registered Design D.R.G.M. of – The marriage of Lothar von Faber’s grand-daughter Ottilie to Count Alexander zu Castell-Rudenhausen brings a change of name for the family and the company: Faber-Castell. At some point the company grows to employess.

A brief history of the slide rules A brief history of the slide rules The first Faber-Castell slide rule was produced in But the history of this useful tool is years older than that. At first it was purely for adding and subtracting; more complicated calculations later became possible. The invention of the pocket calculator in spelled the end of the slide rule.

For centuries it had made calculations easier for countless mathematicians, physicists, engineers, and other occupations. The page reproduced from the company catalogue price list shows examples of rulers and straight-edges and also the two oldest models of slide rule: Both models are only partly depicted, the left-hand half of No. The years around the Great War A later catalogue, dated , offered a wide range of nearly a hundred different rulers, set squares and T squares made of wood, and then 20 models of slide rule of high quality and precision, made of pear wood ideally suited to the task with celluloid scales.

The favourable development since the early days was sadly interrupted by the Great War. Slide rules were still unfamiliar to most people and used only by a limited circle of engineers and technicians, rarely by businessmen. It was therefore not possible to introduce rationalized mass production. However, additional models for specific occupations and types of calculation were produced in collaboration with experts. There were now special-purpose slide rules for foresters and timber merchants and for reinforced concrete work.

Vintage Faber-Castell Slide Rule made in Germany

Founded in at Deansgate, Manchester by Alexander George Thornton, the firm grew to become one of the largest manufacturers of drawing instruments and slide rules in Britain. British Thornton is now a manufacturer of school furniture in Keighley. A traditional pattern set of electrum instruments by A G Thornton dating from the late nineteenth century. The instruments were purchased loose and I adapted an empty steel case to take them by making a set of velvet lined pockets to fit the instrument tray of the case in the same way as they would have originally been made.

Slide rules HOME page I have given the reference when dating the rule. P Hopp refers to “Slide Rules – Their History, Models, and Makers” Astragal Press, 4. Rules for which I have instructions are indicated. They fall into three categories: Scanned from original documents.

Hemmi was granted Japanese patent in for laminated bamboo construction and success seems to have followed quickly thereafter. One can estimate dates of Hemmi slide rules from markings on the rules. I have not been able to narrow the date. Rules with model numbers date from before this changeover, rules with model numbers 20 and above were made after the changeover.

Hemmi continued offering models 1, 5 and 8 to its distributors until WWII or later; these rules occasionally turn up with Post or Hughes-Owens model numbers but no Hemmi model number. The company name was officially changed from “J. Hemmi was incorporated as a public corporation with no change in name. The first inch or first five centimeters of the measuring scales on ten-inch closed body rules is extra-finely divided.

Hemmi continued to operate under that name through at least The Allied Powers occupation of Japan lasted from August until April 28, but the requirement that export goods be marked “Made in Occupied Japan” was in effect for a shorter period–from 20 February to 5 December Note the S scale on the upper slide in the illustration. The S scale on the lower slide in the illustration is an example.

Antique Computing Instrument Collection – Early A. W. Faber Slide Rule

We’ll Always have Casablanca. Supplied He may not have been classically handsome, but he had a beauty all his own. And his Rick, a strong, silent type in a trenchcoat, knew exactly how to deal with an increasingly confusing world.

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 ever produced. Very early wood body rules rules have 3-digit numbers like ”.

Faber’s first slide rules were made of boxwood but in they began using celluloid facings laminated onto the wooden body of the rule and in introduced the metal-rimmed glass cursor. They produced a wide range of slide rules, including specialist electrical and engineering rules. In they patented the Darmstadt scales which added several ranges of log-log scales. Faber continued to develop their slide rules, adopting new scales for specialist functions and new materials so that they could offer a range of affordable student rules as well as the more expensive celluloid faced rules.

As logarithmic slide rules cannot be used for addition and subtraction, in they added an Addiator type calculator, used with a stylus, to the back of some of their range, especially the business oriented models. They began producing injection moulded all plastic slide rules in the s.

Faber-Castell 2/83N Novo-Duplex

See other formats [“Bvoiz- Jf? Faber-Castell at the instance of Professor Walther. Its logarithmic scales make possible all the calcu- lations which are met with in mathematics and their practice. It carries no special scales such as would be required for commercial, nautical purpose, reinforced concrete, or any other narrow field of activity.

The scales of the System Darmstadt Slide Rules are grouped as follows: Even the simplest general slide rule has the upper scales, A and B, and the lower scales, C and D.

Designing a Slide Rule. The less expensive slide rules of simplex type have tended to be made according to several traditional fixed patterns. But duplex slide rules, on the other hand, seem to come in a wide assortment of types.

The collections database also provides information about trade catalogs from at least 32 different retailers and manufacturers and about American and European textbooks and treatises about slide rules, all held by the Smithsonian Institution Libraries. Search by keyword through 18, object records, including slide rules and related documentation. Department of the History of Science, Harvard University. Photographs and detailed descriptions for slide rules, along with links to manufacturer histories.

The Museum of HP Calculators. Historical information, instructions for using a slide rule, and photographs of approximately 50 slide rules. Photographs and descriptions of over 50 slide rules and calculating devices amassed by a physics and engineering professor during his year career. General Resources Cajori, Florian. Engineering News Publishing Company, Pioneering effort at untangling the early history of the slide rule. Their History, Models, and Makers.

Encyclopedic listing of manufacturers and their products. For more guides to slide rules and their histories, see the publisher’s website, http:

En kort historie om regnestokke

Like many people here and in the UK, I am obviously very disappointed about the result of the referendum. I wanted it to end differently and had hoped that Britain would want to play a role in arguing for an outward-looking, flexible, competitive, free trade Europe. But the British people took a different decision, and that is the way that democracy works.

As we move to a new phase, I don’t believe it is right that I should carry on as the British Commissioner as though nothing had happened. In line with what I discussed with the President of the Commission some weeks ago, I have therefore told him that I shall stand down. At the same time, there needs to be an orderly handover, so I have said that I will work with him to make sure that happens in the weeks ahead.

Make: Faber Castell, Germany: Model: 2/83 N Novo Duplex: Notes 1. This was one of the last rules produced by Faber Castell and could be considered the culmination of the development of the slide rule by one of Europe’s leading manufacturers. It is a duplex rule with 30 scales. 2. .

The rules on this page originally comprised two main categories. Alcohol slide rule by J Long, London, made of boxwood and probably dating from the early twentieth century. The rule is almost certainly from a box containing a Sikes hydrometer, which it would have been used in conjunction with see Miscellaneous instruments pages. This appears to be primarily a gauging rule for determining the content of casks whether standing or lying and also functions as a comparative rule. Nine inches long, boxwood and brass..

The upper face is used for costing and the lower face for reducing. A two foot, two- fold rule. A boxwood and brass, three foot, four- fold rule, probably dating from the early twentieth century. It has been repaired, many years ago, with riveted on nickel silver plates. The rule is made of aluminium with brass end pieces. This mahogany and boxwood slide rule is mm long and has two slides. The scales are lettered A to E from top to bottom. Scales D and E are concerned with calculating the weight of a ream of paper using either standard sizes given on scale E or the size calculated using scales A to C.

The Adventures of Mr. Teacher and Answer Girl, Episode 6: Slide Rules!


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