An interesting calculator in super condition. Please refer to the museum library and individual galleries as this page is being built. Also like the high-end Faber and Nestler rules, this rule features extra little rubber "feet" on the end braces so that you can lie the rule down flat on either side and freely move the cursor assembly without scratching anything. There are at least 30 scales, and a host of color schemes to help you keep things figured out. It is by Ross who also made another unusual slide rule. Still, this rule has a sturdy enough feel, and features paint-filled engraved scales and a two-toned appearance. Having contact with the original owner of a slide rule that remembers the year it was purchased helps on determining the age. The rule has a black card case. It appears to have the standard K, A, B, CI, C, and D scales on the face, followed by two unusual natural log scales at the bottom of the face and on the hard edge. Gray cloth covered card case. Basically, the sort of slide rule you'd pick up for a few cents at Woolworths back in the pre-war era. It has a brown leather covered card case and the cursor is aluminium framed.
There is a lot of paper that goes with it so be sure to see all the pics. Not much to speak of, but still kind of cute. The rule is a variation of the classic Darmstadt design, but very simply and cheaply made. That is probably explained by the fact this was a solution looking for a problem that did not really exist. There is also a conversion chart and ruler in the bottom of the case. IWA made lots of specialist calculators and still make slide charts. The previous owner of this one added a few numbers to customize it for his applications. Even the guarantee is in the bottom.. Makepeace, who in started the B. It has a vinyl case. A rare an unusual piece of medical or X-Ray related memorabilia. It looks to have never been used. The leather case is nice with minor scuffs. Two tan scales on later model covering 5. Gil has also taken on the onerous job of translating the accompanying use and care sheet shown in its own scans up above. The five hairline cursor is also very reminiscent of Faber's feature set. It has a cloth backed PVC sleeve. Our current offering of Antiques for sale are at our sister Website Patented-Antiques. Complete with gray cloth covered card case. Apparently all-metal rules never really caught on in Germany. This plain wood rule also features very basic slide rule instructions on the back. The small wooden original stylus is present. Sometimes the copyright date in a manual is used to determine the approximate age, but one printing could span several decades. The original instructions are included as well. The manual is not too bad either, for an entry level rule. Clearly, Russian slide rule technology was languishing greatly behind the West.
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