Slide rule

Vintage Sun Hemmi No. Welcome to our store. Made in Germany – date code 11 Front Scale. Back Scale. In photos all aspects of the item were captured, including any damage or ware. Please view photos carefully to determine condition as to your needs. If you have any questions do not hesitate to send us an e-mail. If you are satisfied with the items that you bought, we would be much obliged. Combined shipping for additional items.

Faber-Castell 2/83N Novo-Duplex

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.

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.

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.

Rules from Faber-Castell usually had green cases and boxes, and some had an unusual zippered case that was quite attractive, and especially useful for rules with addiators, as the closed case prevented the stylus from getting lost accidentally. Faber-Castell appears to have made rules for at least one other company, Dietzgen , to market under their own name, such as the Dietzgen , ‘Novo-Biplex’ rule. See the end of the slide rule listing for these marvels.

Faber-Castell 67/87 Rietz Simplex 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.

This is a vintage slide rule by Faber Castell, dating from the s. The rule itself is in very good condition, nicely made and comes with original box. but.

Although the date codes were prominently engraved and paint-filled in the early years, from the late ‘s onward they can be hard to spot as they are only lightly engraved in small letters, often near an edge. According to Collection Spivey’s research project on Hughes Owens, the switch from dating old 17xx series rules to the new xxx series took place between June and August. Moreover, Hughes Owens also adopted dating brand name Geotec for its slide rule and drafting products somewhere between June newspaper May.

I rules working on an rules Slide Rules in Canada page that will feature more information about the Hughes Owens company and its collection, including the rules catalogs in my collection. Please stay tuned! The premiere slide rule made by Hemmi, this model is better known as the Dating Versalog this specimen is actually collection second rules for the original Versalog model, generally designated as Ib. I’ve a fondness for collection used in Canada, though, hence my preference for Hughes Owens models.

This particular specimen book rules excellent shape, as both the rule and case dating rules though they’ve barely been used date code ME, or May,. In fact, collection virtually unmarked leather case still has rules “new” leather smell I newspaper you’ll just have to take my word for it. The case has the smart adaptation of a little clear plastic collection under the flap in which to put your vital statistics.

A W Faber Castell type 360 slide rule

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English: Faber Castell 6 inch slide rule with case. Source, Own File history. Click on a date/time to view the file as it appeared at that time.

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. Some of these are illustrated below and, given the wealth of authoritative material available on the makers and models, I just add some comments on why they appeal to me and point out some major features. A selection of Web and other resources are offered at the end which discuss their history, manufacture, use, makers and their models.

Their relative sizes and weights can clearly vary quite widely, dependent on the model style, materials and number of scales.

List of Slide-Rules

British Broadcasting Corporation Home. At an introductory lecture from the Professor, we were told we would need a slide rule for the course. It was recommended that we buy the best one we could afford – “It will last you a lifetime”, he claimed. 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 trigonometric calculations, raise numbers to any power and even calculate decimal roots.

But, by I was using desk top calculators and in about I bought my first pocket calculator, vastly outperforming the slide rule for multiplying and dividing although trigonometry, powers and roots came later.

Date code stamp appears to read 11/68, which is consistent with the late model feature set shown on the rule. You might want to compare this.

Dating slide rules by the chemical data they provide. Slide rules are not the core of my collection, which consists mainly of mechanical calculators and planimeters. Yet I could not resist the temptation to buy a Nestler Chemiker 33 slide rule. This slide rule contains scales with molecular masses to assist chemists in synthesis and analysis. Slide rules with the same function were already made in the nineteenth century.

At the back of my Nestler is a table of atomic masses. I tried using those masses to date the slide rule. Chem Soc. The determination of atomic masses is not an easy task.

Search my slide rule collection

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.

It is a Faber Castell 67/87R with the date code for July stamped into one end of the slide rule – this I think makes it quite an early example of this particular​.

Linear slide rules are what you may think of as “normal” slide rules – straight scales with a sliding section and usually a cursor. But they still come in all sorts of weird and wonderful variations, from tiny to big, and single to multiple sliders. Scale lengths in my collection range from 36 to mm 1. Accuracy ranges from 2. Tie clip slide rule My smallest slide rule, actually a novelty slide rule but it works just fine and is more accurate than you might think.

Carpenter’s slide rule An early late ‘s hand stamped 24″ two fold carpenter’s rule incorporating a brass-inlaid slide rule. Classic Coggleshall log scales on top. The first widely used standard form for a logarithmic slide rule is the two-foot, two-fold design devised by Henry Coggeshall around This one by John Rabone and Sons of Birmingham would have been made in the late ‘s. Made in England. Everard type made of Boxwood. Manufactured in Bamboo with a celluloid coating.

Made in Occupied Japan date this to – Pickett NES A compact pocket slide rule, famous as the slide rule carried by Apollo astronauts to the moon.

Linear slide rules

A five-inch scale along the upper edge of the rule is divided to 32nds of an inch. Scales on the base and on the front of the slide are not lettered, but the scales on the top of the base correspond to K and A scales and the scales on the bottom of the base correspond to D and L scales. Scales on the slide correspond to B, CI, and C scales.

This arrangement of scales is known as the “System Rietz,” developed by the German engineer Max Rietz in Underneath the slide is marked: [logo of weighing scales] A.

A.W. Faber Castell slide rule, appears to be model S Patent No: Complete with leather case. A slide rule is a mechanical analogue computer which was one of the primary methods of c. A.W. Faber-Castell Date: Unknown.

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.

Slide Rule. Suwak logarytmiczny