Dating slide rules

Chemical Slide Rules. Dating slide rules by the chemical data they provide. ALRO Chemie (Otto van Poelje) ALRO Chemie showing atomic masses from J. Am.Jason No. 802 Bamboo Duplex Slide Rule Excellent Condition Made in Japan by RelayRicoh Includes Original LEATHER CASE One of a number of.

Jul 21, 2004. The date was also noted at other NASA centers around the country.. We went to the moon with slide rules, retiree Norman Chaffee, who. Cursor Types The cursors used on KE slide rules evolved over the years. When they changed, all production of all models was switched over.There is a definite timeline to the cursor models. Before 1906 - Slide rules either had no cursor, a brass chisel type cursor, or a metal framed glass cursor. Most students learned slide rule use on the linear slide rules, and did not find reason to switch.. historical dating of specimens, Slide Rule Course,.

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KEUFFEL ESSER CORPORATION. HISTORICAL TIME LINE. 1867 - KE. First slide rules imported. 1884 - Second factory built. Opened on January 24th 1885. Consider this your dating playbook, with all the information you need to survive the first date and make sure theres a second one.. lay down some rules. Patent and Copyright Dates Patent and copyright dates are often quoted by sellers of slide rules implying that the rule is that old. The date of a patent only means that the rule was not produced before that date. It is very common to see 4053-3s for sale quoting the 1900 patent date. Title, Primary Class, Description, Inventor, Assignee, Issue Date, Patent No. Calculating-machine, 23584, Circular slide rule. Based upon the fact that. Though there are new realities to deal with if youre dating after 50 (illness, sandwich generation concerns,. The whole Rules thing.

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  • K+E (Keuffel & Esser) Slide Rule Model Archive

Dec 3, 2008. Keuffel and Esser (KE) were a US manufacturer of slide rules. and the. Using the rather arcane dating algorithms for KE slide rules, this. Find deci lon and slide rule from a vast selection of Science Slide Rules. Get great deals on eBay! Sep 27, 2002. My collection of KE slide rules.. Additional dating information has been obtained from a variety of sources, with special thanks to Ed. Welcome to e-Bay Slide Rule Search. AND ONLY IF Date AFTER (Optional). January, February, March, April, May, June, July, August, September, October. engineers in tights made sure slide rule innovation persisted well. Nestler slide rules can be tricky to date but as this pocket slide rule is made of ANAGIT12.

Vintage Instruments offers the largest variety of slide rules for sale anywhere, plus a wide variety of other instruments, including drafting tools, planimeters. Nov 26, 2014. Theres a certain scary fascination in circular slide rules designed to calculate environmental conditions following a nuclear holocaust. Make Keuffel and Esser Model Decilon 68 1100 Notes. 1. The complex rule was regarded by many as the best rule produced in the US. It is a duplex rule and has 26. Click on this and all pictures for a complete full-size view of the slide rule) Selective Luddite that I am, Ive long been fascinated with slide rules. Slide Rule invented by William Oughtred. William Oughtred (5 March 1574 30 June 1660) was an English mathematician born in Eton. After John Napier. Slide Rules Students will learn about the history of slide rules, how they work, and then make their own. Slide Rules 1 2005, OMSI www.omsi.edu Spheres Slide Rule Site provides an opportunity to get new and used slide rules from. Brand NEW 7 Inch Circular Blue Date Finder Slide Charts from Datalizer Aug 17, 2002. After Hemmi dropped the Made in Occupied Japan logo in about 1951 they began placing date codes on certain rules. This code took the.

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The slide rule, also known colloquially in the United States as a slipstick, is a mechanical analog computer. The slide rule is used primarily for multiplication and. The slide rule, also known colloquially in the United States as a slipstick, is a mechanical analog computer. The slide rule is used primarily for multiplication and. Otis King Patent Calculator Model L - Cylindrical Pocket Slide Rule with Helical scales, photos and text Dating KE slide rules is a complicated task, as serial numbers were recycled three times at KE. Based on external clues from the body and cursor (although. Apr 19, 2016. Teams and managers have been up in arms over the new Chase Utley rule on slides, but there is nothing ambiguous about itand they. Otis Kings Patent Calculator Cylindrical Pocket Slide Rule with Helical Scales, Made in England by Carbic Ltd., London 1921-1972 Many thanks to Andrew Davie and his. I have a fond affection for slide ruleswhen studying the sciences at high. Hemmi used two letter date codes, this one FG, which allows it to be dated to July. the serial number series rollover dates and slide rule dating by Richard.. XXXX slide rules is around 500000, which gives a CD rollover date of 1968.

The iconic slide rule, long identified with the science and engineering. and have finally secured all but the very earliest (for items pre-dating the 19th century,. Although I have entitled the article Thornton Wooden Slide Rules I have also. However actual rules seen with frameless cursors dating from 1937 or later. My collection of Pickett slide rules. Pickett Slide Rules.. Update An excellent Pickett dating resource is now available at the slide rule museum. Pickett Model 4. Dating KE slide rules is a complicated task, as serial numbers were recycled three times at KE. Based on external clues from the body and cursor (although. But dating from 1977 it has the honour of being the last specially designed textile slide rule although BH continued making P models, including many textile.