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. Post-branded slide rules were initially produced by a range of German manufacturers, but in Post selected the Japanese company Hemmi Keisanjaku to produce the bulk of their slide rules from that point forward. By far the most common of these Hemmi-manufactured Post slide rules is the Versalog , a 10″ duplex slide rule with 23 engine-divided scales. When I was studying Materials Science at UCLA in the ‘s, I had a discussion with several professors about the applicability of various materials for making slide rules.
Dating faber-castell slide rules
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.
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.
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John & Della Ireton
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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.
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.
Seems like a good idea, rather than marking up the leather. I don’t know about you, but I’d hate to lose a rule like this! I’ve also obtained the Hughes Owens versions of rules hard-cover Versalog instruction books, both the first and rules Canadian editions hemmi above.
My Slide Rule Collection
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.
Description, Price, Date, Bids. Prices of slide rules sold on Rare Vintage SUN HEMMI Slide Rule No , $, Oct, 7. Sun Hemmi bamboo #
This is the rule that kept Post in the slide rule business. In many persons’ opinion it was the best general engineering slide rule ever made. About one million were sold between and The “Versalog” duplex slide rule was introduced in late or early Dual marked Versalogs [see below] are marked “Copyright Both Post and Hemmi said the Versalog was built for Post to Post’s specifications but several early Versalog specimens are dual marked “Post ” and “Hemmi It certainly appears that Hemmi intended to sell these rules in Japan as Hemmi model before changing their mind, recalling the rules, and adding Frederick Post markings.
Warren Salomon divides the “plain” Versalogs into two sub-models: “IA” from to , with scales in navy and red only, and” IB” from to , with the COS scale in green. Versalog II re-arranged the existing scales and added an “A” scale for a total of The Post Company, itself, sometimes seemed confused about which model Versalog it was selling.
The story of Bill Hewlett’s iconic computer in a pocket. I don’t in fact have either one, so it could be that the plastic is marvelous in the flesh. I simply refuse to believe that I wouldn’t prefer mahogany or bamboo. Or even…. Now these guys were in fact heroes.
Date, Bids, Price ($), Text. Jan, 4, , POST VERSALOG JAPAN HEMMI SLIDE RULE WITH CASE. Jan, 1, , Post Sun.
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. I bought a new Post Versalog for technical college in There is no serial number or date code to be found.
Hemmi Slide Rule No. 260 for Mechanical Engineer
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.
date unknown. View. Keuffel and Esser Polyphase Duplex 10″ Linear slide rule Sun Hemmi Mannheim 5″ linear slide rule.
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. The parallel bars of the stock are connected by the sheet metal strip 3 so that, if excessive clearance is produced between the contact surfaces of the stock and the slide by wear, the sheet metal strip may be slightly bent in such a manner that the two ed es can approach each other.
The plate 6 may be fastened to said other memberby a set screw 7 or other suitable means. By this construction the two parallel bars may be adjusted to increase or. It must be understood that the present inventlon is not limited to the constructions above described, but the construction may decrease the clear- 7 bamboo fibers forming non-absorbent anti- 1iriction sliding surfaces between said memers.
Hemmi 153 Duplex Slide Rule
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.
My collection of Sun Hemmi slide rules. Also around this time, they started engraving 2-letter date codes on all their rules representing the.
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.