Lawrence made the low-end slide rules, and they later became Sterling and spun off a few other makers. Some of the cheaper slide rules were just a piece of wood with the scales printed on it. It was just our standard of quality that we wanted to have. Some of the British slide rule makers included Blundell and Stanley, British Thornton, and Technical Standards. Included an accessory pocket ruler with conversion data and number interval standards. There were over 800 different slide rule manufacturers during the heyday, a lot of people making slide rules. The 1900 patent date shows up on all 4053-3s until the beginning 1930s.Next
The collecting will never end. The outer two strips are fixed so that their relative positions do not change. I have just learned of a old local retailer, now gone, was producing a range of slide rules. This has got to win the prize for the longest standard slide rule that I have ever seen I've clocked it at just a hair past 14 inches. Computers also changed the nature of calculation.Next
Probably a little later than the one above, it is in much better condition. At one time you could buy a low-end slide rule for a quarter. Yet with the advent of inexpensive pocket calculators in the early 1970s, slide rules quickly went the way of the Dodo. For most of the masses this is not possible: the changes are so subtle that the scale resolution of a slide rule is insufficient. The Binary Slide Rule manufactured by Gilson in 1931 performed an addition and subtraction function limited to. This makes visiting the on-line galleries more interesting to visitors and we can honor their your life and career in this small way. But many slide rule collectors just focus on trying to collect every type of slide rule they possibly can.Next
The original intent was to allow the user to select an exponent x in the range 0 to 2. The commissioned specials are abundant and go back to the early 1900s and extend to the end of slide rule production in 1975. It appears to be through web search , the most popular one i find from 1947…. Thanks to Dan Cherry, Peter Owens and Ray Hems for providing many additional model photos and descriptions. With slide rules, there was a great emphasis on working the algebra to get expressions into the most computable form.Next
According to Guus Craenen production took place between 1910 and 1955. Teledyne had bought Post in the late 1970s, and then within two years no one was buying slide rules anymore. The first issue had metal end blocks. They show different slide rules and the history and different dates. Your name required Your email will not be published required Your comment. The first models have exposed bamboo edges, which changed to celluloid covered edges in late 1962.Next
Never seen anything like it in person, only in pictures. The metric system was used in all the slide rules, so it was really a matter of how many different colored inks you might use or the size or the placement of the slide rule. So there were several models sold that had a math calculator on one side and a slide rule glued to the back to do those other functions. The 1444D, 1447D and 1452D were made by Charvoz-Roos. Answers to all those questions.Next
Navitimer wristwatch with circular slide rule Circular slide rules come in two basic types, one with two cursors left , and another with a movable disk and a single cursor right. Copyrighted 1913, still in its original tan leather cover. The slides and frame were cut from the same piece of stock and for best stability over the life of the rule they should be mated together in final assembly. Other Places to go in the Slide Rule Universe: from our extensive on line marketplace, with restored classics, amazing new in the box rules, and low cost first student rules. Construction: Early rules were made of hardwood usually mahogany , with a few made in brass.Next
The most popular were , usually and , log 10 for taking the log of a value on a multiplier scale , ln and e x scales. The slide rule also required you to know the reciprocals of numbers or how to find them. The First Edition Oughtred Society Slide Rule Reference Manual is now available. There are mistakes in the catalogs both in descriptions and illustrations. Some manufacturers just made slide rules, but others made drafting instruments and anything that had scales on it or was used for mechanical drawing.