My Slide Rule Collection

McFarland entry. David passed on April 20, at the age of Even while in a wheel chair he attended all the Oughtred Society meetings. Collector and donor of slide rules to ISRM galleries. Watch my progress. Created a separate page for the Brand Index. Large line spacing between link targets for touchscreens. You will see erratic behavior. Weaver’s personal references and are non-sequential.

Linear 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.

Making examples from published templates is also fun.

Hemmi duplex, open body and all-plastic slide rules do not have measuring scales. • Dates: Rules marked “J. Hemmi” date from or before. Rules marked.

This is the rule that kept Post in the slide rule business. In many persons’ opinion it was the best general engineering slide rule ever made. About one million were sold between and The “Versalog” duplex slide rule was introduced in late or early Dual marked Versalogs [see below] are marked “Copyright Both Post and Hemmi said the Versalog was built for Post to Post’s specifications but several early Versalog specimens are dual marked “Post ” and “Hemmi It certainly appears that Hemmi intended to sell these rules in Japan as Hemmi model before changing their mind, recalling the rules, and adding Frederick Post markings.

Warren Salomon divides the “plain” Versalogs into two sub-models: “IA” from to , with scales in navy and red only, and” IB” from to , with the COS scale in green. Versalog II re-arranged the existing scales and added an “A” scale for a total of The Post Company, itself, sometimes seemed confused about which model Versalog it was selling.

Dating faber-castell slide rules

The story of Bill Hewlett’s iconic computer in a pocket. I don’t in fact have either one, so it could be that the plastic is marvelous in the flesh. I simply refuse to believe that I wouldn’t prefer mahogany or bamboo. Or even…. Now these guys were in fact heroes.

Sun Hemmi Duplex Bamboo Slide Rule No from Japan. $ + $ shipping. Hemmi No Civil Engineer Slide Rule Duplex Celluloid on Bamboo​.

Sun Hemmi electrical ten inch slide rule. Popper fastening black, cloth covered, card case. Sun Hemmi duplex ten inch slide rule. Tan leather case and celluloid sheet of tables. Dates from s. Sun Hemmi No. Complete with black card case and English printed instruction booklet. Dates from to World War II. Sun Hemmi P plastic, ten inch, open frame, simplex slide rule. Complete with blue and gray plastic case.

Date code XG for July Sun Hemmi P S five inch, closed frame, plastic slide rule. Date code WA, January The rule is mint with leather slip case, instructions and outer card box.

Hemmi Duplex Slide Rule Retailed by Post (Versalog 1460)

Hemmi No. P “Business” Slide Rule. Duplex bamboo body rule, with leather case, with full manual.

Object Title, Slide Rule. Manufacturer, Hemmi Slide Rule Co., Ltd. Date of Object, Unknown. Model, 40RK. Serial Number, C. Dimensions, 28 x x 1 cm;.

Hemmi rules have a very distinctive style, with engraved and filled scales. They are very robust as a result, and do not wear out easily. Many of their rules that are more than years old are still in wide circulation, and are still completely readable and work perfectly. Most of their rules have bamboo bodies, with laminated white celluloid scale faces. The unique non-warping and self-lubricating nature of bamboo, made these rules extremely popular, and long wearing.

Hemmi later made plastic body rules part numbers generally begin with P which are also of very high quality, and were rebranded and sold by others outside of Japan. The Hemmi duplex cursor is an excellent design, and largely self-aligning, unlike virtually all other makes. Hemmi’s slide rule designs always had many small features that were both ingenious and useful, making the rules a delight to use.

Hemmi Slide Rule No. 260 for Mechanical Engineer

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Determining Dates of Hemmi Slide Rules. Jirou Hemmi and Co. was founded April 15, but no Hemmi slide rules from before about are known.

My first serious rule was a Hughes-Owens Versalog model. Wonderful instrument! Went to the army for two years, and when I returned there wasn’t a slide rule in sight. My HP saw me through my degree and my first years in the aerospace industry. Anyway, when I became aware of the date codes, I wondered why I couldn’t find mine. Now I know.

Calculators available for adoption

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.

See more ideas about slide rules could use a museum. Or mock the simple rules hemmi was discovered by faber castell slide rules indian dating from j. Dating.

The object of this invention is to provide a slide rule having a hard antifriction and non-absorbent surface which will avoid the expansions and contractions due to changes from dry to moist or moist to dry atmospheres and facilitate the movement of the slide. In the accompanying drawings Figure 1 is a perspective view of a slide rule embodying this invention. In the form of embodiment shown in Figs.

One bar of the stock 1 is composed of a base layer a; and a top layer 6, the latter being provided with a groove or slideway c on its inner face and the other bar is composed of a base layer 03 and a top layer 6, the latter being provided with a slideway or oove f on its inner face. The slide 4 is composed of a base layer 9, a top layer h and side layers 91 and 9′ disposed vertically of said base and top layers and covering the edges thereof.

The said layer 71 is provided on its outer face with a tongue 70 adapted to fit the slideway 0 and the side layer j is provided with a tongue Z adapted to fit the slideway f. The base and top layers 9 and h are composed of bamboo strips disposed back to back and cemented together and the side layers 11 and j are composed of bamboo strips cemented to the sides of said base and top strips and covering the joint between them.

The fibers of bamboo are always longitudinal and of a hard and silicious character which is non-absorbent of moisture and provides smooth, unchanging antifriction surfaces between the slide and its stock. The parallel bars 2, with scale plates m, suitable material containing the graduations and the slide may be provided with a scale plate 0 composed of celluloid or other suitable material for its graduations.

John & Della Ireton

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. Com: i mention it has a vintage slide rule? There are people. Com: i.

The standard slide rule used 25 cm (some 10 inch) long scales— the top one Hemmi used two letter date codes, this one ‘FG’, which allows it to be dated to.

Other Slide Rule dates are currently in development. Assistance in this effort will be appreciated. Please refer to the museum library and individual galleries as this page is being built. Example: St. Louis 12, Missouri. The following time-line, researched by Denise M. He becomes their Midwest sales rep. Charles Bruning is Fred Post goes to work at Eugene Dietzgen’s company.

The Bruning boys work for another blueprint company. They all learn the blueprint business. Jacob Bruning and W.

Hemmi 153 Duplex Slide Rule

At the time, bamboo construction was preferred. When the HP came along, it dominated quickly! Post distributed a wide range of slide rule models, both under their original brandings and rebranded as Post products.

Circular Rules: The original type of slide rule, a bit harder to find, but The “Sun Hemmi” line tended to be made from laminated bamboo, There is no date on the package or the instructions, nor a copyright on the rule itself.

There seems to be a problem serving the request at this time. Skip to main content. Filter 2. All Auction Buy it now. Sort: Best Match. Best Match. View: Gallery view. List view. EUR

Talk:Slide rule

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A Sun Hemmi 4″ pocket slide rule with original leather case. Front scale A, B, CI, C & D. Rear scale S,L & T. Made in Occupied Japan date this to –

All purchases and fees on this page go toward maintaining the museum website and supporting the Slide Rule Loaner Program for Schools. The specimens they replace, however, may be items in the fund raiser. The recommended fee is based on the average total cost of ebay sales for similar specimens over the past two years. All returns accepted, just pay return postage. If you wish to contact me directly and offer a different amount, we will work with you to serve both our needs.

Call the Curator, Mike Konshak, at days and evenings A list of specimens to be offered is being compiled and will be shown here, very soon. Then each slide rule, manual or other related items will be scanned or photographed and added to the listing. The descriptions will be brief as one may look at other specimens in the respective galleries. Thank you for your patience. Email or call Mike, if you run into problems please. It takes a bit of time for the Curator to respond so, if for some reason, the slide rule has already been adopted, you’ll be emailed to see if there is another slide rule that you want to rescue, switch to a direct donation, or get a refund.

Personal checks are also accepted. Thanks for your support!

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