A couple SKALA rules have an interesting trigonometric scale they called M. Another alternative for solving right triangles. Joe

Hi Meine, I also have this Ecobra 143. It is named by the way Darmstadt Spezial, not Rietz, and it has more or less a log log layout with trig on slide. For a good usage however a

hmmm, have to learn how to use search engines better -- adding the '#s' The Jakar has the same scales on the back of the slide as my NoName vendex. Jakar seems to be Japanese, most on the ISRM made by

One of the slide rules I got is a Blundell Academy Duplex Model 503. The front side is just another slide rule having 'L K A [ B CI C ] D S ST T' scales. The back however has 'M1 MONTHS [ DAYS-WEEKS

Hi Meine, if you go tp Herman's Archive Search at: https://sliderules.lovett.com/herman/hermansearch.html and insert: #s LL3 LL2 A = B CI C = D K LL1 into the first field you get five hits

I got quite a bunch of slide rules and one of it had no markings at all. However, on a Sunny Sunday afternoon I found out what it was. Here I share my strategy for a 'Determination of Slide Rules' The

Maynard, Wow. Any handmade calculator is interesting to me. If it's not too burdensome, perhaps you could post a photo of that device to the group? Also, thanks for that earlier message about

I don't recall ever seeing a commercial circular slide rule with two cursors while I was working in telecom engineering in California for about 40 years.  I think, though, that I had to have been

And to correct an earlier statement from me: As John's video shows, the Atlas has CI scale sitting right next to the C scale. I've been toying with the Atlas for two days now, and hadn't spotted it.

Well most likely it is difficult to get into an market if nobody ever saw something and it is or looks complicated. But why wasn't the Gilson used at American universities, or was it? Was it used by

Why was the two-cursor, one-disk format not more popular in Europe? Why was the Pythagorean P scale not more popular in North America? Good questions. No idea. -- John Runnels

Thanks, John, I understood now the principle. When using normal dividers the change of scale is not possible that easy, neither on linear nor on circular sliderules, this only works with radial

Home computing pioneer Sir Clive Sinclair dies aged 81 Creator of the landmark ZX Spectrum and the less commercially successful C5 died after a long

Hi Andreas > I do not think that this issue is mainly linked to CI but CF. CF on a > circular slide or dialrule would only make sense if pi folded. I've not seen a folded scale yet, but if I spot one

This is a follow up on post-IM2021 questions about how to do chained calculations on a Gilson Slide Rule. Here is a short video illustrating how one might do a longer chained calculation on a Gilson

If a sliderule from 1947 has wooden pegs then I slowly think that they took everything which earlier they sorted out and make something useful out of it. M for "aus dem Müll" (out of garbage!-)

Andreas, "you can try and use "Dr. Beckmann Fleckenteufel Stifte und Tinte" to remove the ink" Available from Amazon.de for half the price of a cup of coffee. Gabriel P.S.: No, I don't work for Amazon

Andreas, you can try and use "Dr. Beckmann Fleckenteufel Stifte und Tinte" to remove the ink. I've done this several times on Nestler slide rules without causing any damage to paint which is used for

Andreas and others, Just to complete the picture, I have now found my beech wood Rietz and checked it over, taking into account all your observations. Mine is also dated April 1947, but is labeled

Hello Andreas, My 1/54m is dated 04/1950 which means after military government. Sorry :-). Best regards, Gabriel