Slide Rules!

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.

5 Rules For Sliding Into Someone’s DMs In 2019

Frederick Post Co. Richardson was a supplier to Post in and Post began importing Sun Hemmi slide rules with the Post brand around After April, slide rules were just stamped “Made In Japan” as before the war. Post was acquired by Teledyne in December, Some Versalogs began to be labeled with the Teledyne brand in late The Versalog made specifically for Post by Hemmi is their most well known and collected slide rule.

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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. The general consensus was that slide rules made of bamboo were the most mechanically stable and likely to generate reproducible results over time under the broadest conditions.

Professor Lin was undoubtedly the single person with the greatest knowledge and experience working with bamboo who ever lived. From Wikipedia, the free encyclopedia. This is the talk page for discussing improvements to the Slide rule article. This is not a forum for general discussion of the article’s subject. Put new text under old text.

Carrier Ductuler (Bamboo), 1961.

Sokoloff’s work opened up the field of neuroscience by providing a way to image how brain function affects mental health. The power came from the number of scales and the use of lettering, which enabled the log-log scales to be doubled. Pickett dropped the Eckel name in , and the logo dates from , but scientists would care mainly about its usability, not its date of manufacture.

“Dad says that anyone who can’t use a slide rule is a cultural illiterate and would care mainly about its usability, not its date of manufacture.

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Frequently Asked Questions.

Sliding Through Science History, Part 2

This part of the Hemmi Catalogue Raisonne lists Hemmi-made slide rules for which I know no model number. These rules were given names “Calorie,” Real Estate” instead of model numbers, or were made for other companies SKF, Carrier, Foxboro or made for the military. There are also some rules which probably were assigned Hemmi model numbers but I don’t know what that model number was–e.

I will be greatly indebted to anyone who can supply any more information about any Hemmi slide rule.

might have heard of us through the purchase of slide rules from the Colin Barnes lens measure dating from ‘after ‘, perhaps implying that such an.

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.

Calculators available for adoption

I was a research assistant working on this project about April , I think. At that time I was working for Lockheed on a Defense Department project designed to provide some improvements in computational power for tank crews. Our initial goal was to provide an electronic calculating device for use by tank gunners and crew, generally for calculating ammunition trajectories. This task generally had to be performed in poor lighting conditions, perhaps under battle conditions with emergency lighting only.

My name is Iva C. Cretz, and not only have I’ve seen this rule, but I have one. as the many military slide rules and conversion widgets which were available. The device did, however, produce the most accurate calculations to date, and.

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. This model is regarded by some as one of the finest slide rules ever made. Its combination of size, build, sophistication of scales offered and attractive use of colour gives a slide rule that impresses! This is the only duplex model of the four shown, i. Rubber strips on metal brackets allow desktop use and a rubberised grip on ends of slides also aids use.

This, like other rules with screwed brackets, allows retensioning of the slide to suit and realignment of upper and lower stators if required.

Post Versalog II slide rule

With this quote, President John F. In fact, some even doubt whether it ever occurred. One giant leap for mankind. Imagine traveling , miles, unfolding a landing vehicle and separating it from the command module in order to land on the moon, picking up samples, re-entering the landing vehicle, launching it off the surface of the Moon, reconnecting with the command module, and returning home with a computer onboard that only had 36K of memory and 1 Megahertz processor.

The key to this achievement was an iterative process of taking the next step toward the ultimate goal.

Post Versalog II slide rule. Date: Inventory Number: Classification: Slide Rule. Subject: calculating instrument,. Maker: Hemmi (​).

Over the past twenty years I have given much thought to analog clocks, sorobans, and slide rules. The case of the analog clock is the simplest: for a time, it looked as though analog clocks and watches might be replaced completely by digital clocks and watches. That did not happen. Because I have surmised, and undoubtedly there is considerable research that backs me up people cannot organize their time using a digital clock the way that they can with an analog.

Twenty minutes on an analog clock is one-third of a pie. I’ve thought less, but some, about sorobans. The word is that these analog calculators are still in use in Japan, where most people can add and subtract numbers more quickly with sorobans than they can with digital calculators. Apparently, a calculator is faster for multiplication and division.

The Slide Rule