Slide rule manufacturers. Sphere's Slide Rule Marketplace

Eric's Slide Rule Site

Slide rule manufacturers

Premium slide rules included clever catches so the rule would not fall apart by accident, and bumpers to protect the scales and cursor from rubbing on tabletops. The logo changed in 1962 and again in 1964. This separate calculation is less likely to lead to extreme calculation errors, but forces the user to keep track of magnitude in short-term memory which is error-prone , keep notes which is cumbersome or reason about it in every step which distracts from the other calculation requirements. But everybody had to have one for school. People would write their names in case it got lost. With proper care and use you may expect years of accurate service and satisfaction.

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Dietzgen 1767 National Simplex Slide Rule

Slide rule manufacturers

Leave a Comment or Ask a Question If you want to identify an item, try posting it in. Basically the best of breed of each manufacturers and maybe a sample of some of the older ones, how they evolved from wood to celluloid to maybe metal and a complex plastic one. It probably dates from between 1920 and 1950. This instruction manual is for the 4081-3. An earlier version of the National, the 1767P, had a different set of scales.

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Sphere's Pickett Slide Rule / Company Archive

Slide rule manufacturers

The bulk production continues after the approval! One screw on the back bottom side is missing. Another point is to look for things that can decrease the value of a slide rule, like if somebody has written their name on it. I guess slide rules strike a common meme among people my apologies to Richard Dawkins for the pun. Archived from on April 15, 2012. May slide rules always rule. Graves, reported that he used this rule as a college student.

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Slide rule

Slide rule manufacturers

See Felsenthal's company history with 1977. You can also check out my page for some examples. A black leather case is lined in pink plastic. Prices are presented in dollars for the sake of comparison but have been converted from the original at current exchange rates. It comes in various varieties with all the other parameters required by different users.

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Collectible Slide Rules for sale

Slide rule manufacturers

Note that the full Pickett teacher's manual that covers this rule and others is now on line. But slide rules never made it into daily life because you could not do simple addition and subtraction with them, not to mention the difficulty of keeping track of the decimal point. There is a case for this rule. Based in Louisville, Colorado, Mike can be reached via his website, , which is a member of our. You make number marks according to functions that form a homomorphism between, say, multiplication in one domain and addition in the other. I want readers to know I did not shoot from the hip, but did some research before posting.

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Collectible Slide Rules for sale

Slide rule manufacturers

The 4053 section is dated 1909. Some of the British slide rule makers included Blundell and Stanley, British Thornton, and Technical Standards. The use of slide rules continued to grow through the 1950s and 1960s even as computers were being gradually introduced; but around 1974 the handheld electronic scientific calculator made them largely obsolete and most suppliers left the business. Neither was discussed or even conceived at the time I was learning to use a slide rule. Europe also used basswood and mahogany, but different variations of it. The lower part of the envelope has scales labeled sigma standard deviation and D a standard slide rule logarithmic scale for multiplication, running from 10 to 140. The slide has several markings above the scales.

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slide rule, slide rule Suppliers and Manufacturers at support.imploded.com

Slide rule manufacturers

This duplex rule has a good complement of normal, inverse, folded and trig scales, very attractive appearance. . The left index for the B scale is aligned with 4 on the left half of the A scale. It is also possible that some slide rule manuals have been listed under slide rules. This was especially useful for fractional powers. The front has two interlocking yellow-green plastic arms, pivoted at the center with a metal nut and bolt with metal washers on both front and back.

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The Last Slide

Slide rule manufacturers

Instead of plugging numbers into a computer program, an engineer would understand the fine points of loads and stresses, voltages and currents, angles and distances. Note that the full Pickett teacher's manual that covers this rule and others is now on line. Multiplication and division problems that may be solved on the C and D scales may also be worked on the A and B scales. Replacement parts are scarce, expensive, and generally available only for separate purchase on individual collectors' web sites. By the 1950s, it was a sub-brand of Markant, an East German company that copied designs for Pelikan fountain pens as late as the 1970s. One pair of scales is divided logarithmically from 1 to 100 as A and B scales , and the other pair is divided logarithmically from 1 to 10 as C and D scales.

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