
Slide rules of rocket pioneers Von Braun and Korolev / Koroljow / Nestler 37 vs 23R
I checked some videos. Here: https://www.youtube.com/watch?v=YqDWr25qHQo At about 22 minutes a guy with a slide rule is shown. The type can't be seen except that it is a 25cm model. A simplex model wi
I checked some videos. Here: https://www.youtube.com/watch?v=YqDWr25qHQo At about 22 minutes a guy with a slide rule is shown. The type can't be seen except that it is a 25cm model. A simplex model wi

By
Andreas Poschinger
· #2250
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Slide rules of rocket pioneers Von Braun and Korolev / Koroljow
Hi, In wikimedia commons there is this picture: https://commons.wikimedia.org/wiki/File:Wernher_von_Braun%27s_slide_rule_by_Matthew_Bisanz.jpg (choose the highest resolution) which is not a lot better
Hi, In wikimedia commons there is this picture: https://commons.wikimedia.org/wiki/File:Wernher_von_Braun%27s_slide_rule_by_Matthew_Bisanz.jpg (choose the highest resolution) which is not a lot better

By
Andreas Poschinger
· #2249
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Slide rules of rocket pioneers Von Braun and Korolev / Koroljow
Hi Robert, that was my first mail to this topic. Actually both can't be 23R. If you compare the scales and their tickmarks on the two pictures, it is very clear that the lower scale is the Electro sca
Hi Robert, that was my first mail to this topic. Actually both can't be 23R. If you compare the scales and their tickmarks on the two pictures, it is very clear that the lower scale is the Electro sca

By
Andreas Poschinger
· #2247
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Slide rules of rocket pioneers Von Braun and Korolev / Koroljow
Am 19.01.2022 um 06:19 schrieb Mark Davis: Product placement: Yes, most likely; he tried to be a "good American" though there are rumors that main language in the "kernel development team" was German.
Am 19.01.2022 um 06:19 schrieb Mark Davis: Product placement: Yes, most likely; he tried to be a "good American" though there are rumors that main language in the "kernel development team" was German.

By
Andreas Poschinger
· #2246
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Calculation of the resonance frequency
Hi Eamonn Here I do not agree. Using 39.5 IS the value transfer that I meant! Who just knows what is 4*pi^2? And its calculation most likely needs at least one slide and one cursor setting. I'd by the
Hi Eamonn Here I do not agree. Using 39.5 IS the value transfer that I meant! Who just knows what is 4*pi^2? And its calculation most likely needs at least one slide and one cursor setting. I'd by the

By
Andreas Poschinger
· #2243
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Slide rules of rocket pioneers Von Braun and Korolev / Koroljow
PS: I found the video from Braun: https://www.youtube.com/watch?v=Sz7njI0wEIw
PS: I found the video from Braun: https://www.youtube.com/watch?v=Sz7njI0wEIw

By
Andreas Poschinger
· #2239
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Slide rules of rocket pioneers Von Braun and Korolev / Koroljow
Hi Mark, well the source of this picture from Braun's slide rule is also unclear for me. Is there an original source on a official site of a museum? What would be the link? Concerning the wear: I once
Hi Mark, well the source of this picture from Braun's slide rule is also unclear for me. Is there an original source on a official site of a museum? What would be the link? Concerning the wear: I once

By
Andreas Poschinger
· #2238
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Slide rules of rocket pioneers Von Braun and Korolev / Koroljow
Hi, there is the rumor that Koroljov and von Braun used Nestler 23R slid rules; look e.g. here: https://www.mathscinotes.com/2017/01/sliderulesoftherocketpioneers/ When I look however closely to
Hi, there is the rumor that Koroljov and von Braun used Nestler 23R slid rules; look e.g. here: https://www.mathscinotes.com/2017/01/sliderulesoftherocketpioneers/ When I look however closely to

By
Andreas Poschinger
· #2236
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Calculation of the resonance frequency
Hi, Am 17.01.2022 um 07:57 schrieb Eamonn: yes, so do I. The Versalog and N4 somehow belong to the "classics" and I made it to obtain a copy of each one. The N4 is still on my list to play with but ma
Hi, Am 17.01.2022 um 07:57 schrieb Eamonn: yes, so do I. The Versalog and N4 somehow belong to the "classics" and I made it to obtain a copy of each one. The N4 is still on my list to play with but ma

By
Andreas Poschinger
· #2235
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Translation of Chinese manual for Tianjin / "Gong Nong Bing" 6508 slide rule
Hi Mark, it seems to borrows some ideas from the Flying Fish 1018 and some from German slide rule design. It has the P, Q, Q' and I, J scales but not its special trig scales. The Trig seems to be quit
Hi Mark, it seems to borrows some ideas from the Flying Fish 1018 and some from German slide rule design. It has the P, Q, Q' and I, J scales but not its special trig scales. The Trig seems to be quit

By
Andreas Poschinger
· #2233
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Calculation of the resonance frequency
Am 16.01.2022 um 08:20 schrieb Eamonn: Yes I agree that it is a little unhandy to do further calculations on DI "reversing" all multiplications and divisions though it is possible compared to R1/R2 an
Am 16.01.2022 um 08:20 schrieb Eamonn: Yes I agree that it is a little unhandy to do further calculations on DI "reversing" all multiplications and divisions though it is possible compared to R1/R2 an

By
Andreas Poschinger
· #2227
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Calculation of the resonance frequency
Hi, the following example uses 20nF (even*odd=>first decade) and 165mH (odd*odd=>second decade). Calculation with two slide settings (<... slide setting, <...cursor setting, <... slide setting to cu
Hi, the following example uses 20nF (even*odd=>first decade) and 165mH (odd*odd=>second decade). Calculation with two slide settings (<... slide setting, <...cursor setting, <... slide setting to cu

By
Andreas Poschinger
· #2219
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Calculation of the resonance frequency
I am afraid that transferring the value was intended on this slide rule. This is why I believe that R1/R2 scales are stupid on slide rules for EE use. There are in theory two possibilities to avoid th
I am afraid that transferring the value was intended on this slide rule. This is why I believe that R1/R2 scales are stupid on slide rules for EE use. There are in theory two possibilities to avoid th

By
Andreas Poschinger
· #2216
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Calculation of the resonance frequency
Hi Mark, thanks; sorry that I could not answer earlier. Today I had a look to understand what happens with the CIF scale. When using it for standard multiplication instead of CI it multiplies with the
Hi Mark, thanks; sorry that I could not answer earlier. Today I had a look to understand what happens with the CIF scale. When using it for standard multiplication instead of CI it multiplies with the

By
Andreas Poschinger
· #2209
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Looking for scan of middle 4 pages of RotaRule AA manual
Hi, beside the resonance frequency I have some other issues with the RotaRule: For what were the 50inch scales practically meant? Stadia calculations? But if, how can it be that the other Stadia relev
Hi, beside the resonance frequency I have some other issues with the RotaRule: For what were the 50inch scales practically meant? Stadia calculations? But if, how can it be that the other Stadia relev

By
Andreas Poschinger
· #2204
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Calculation of the resonance frequency
Thanks Paul. Unfortunately US slide rules are quite difficult to obtain in Germany and my usual limit for slide rules is 15Euro:) [30 for such which I want to have under all circumstances, usually if
Thanks Paul. Unfortunately US slide rules are quite difficult to obtain in Germany and my usual limit for slide rules is 15Euro:) [30 for such which I want to have under all circumstances, usually if

By
Andreas Poschinger
· #2203
·


Calculation of the resonance frequency
Hi, I thought about calculation of the resonance frequency and found some solutions working on "normal" slide rules which I attach. I do not know how it would be on the RotaRule. I still did not find
Hi, I thought about calculation of the resonance frequency and found some solutions working on "normal" slide rules which I attach. I do not know how it would be on the RotaRule. I still did not find

By
Andreas Poschinger
· #2201
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Looking for scan of middle 4 pages of RotaRule AA manual
Hi Mark, on page 8 I did not find this example. Thats why I asked. On page 8 there is the claim "that almost every combination of four numbers containing pi" can be solved in one setting by means of C
Hi Mark, on page 8 I did not find this example. Thats why I asked. On page 8 there is the claim "that almost every combination of four numbers containing pi" can be solved in one setting by means of C

By
Andreas Poschinger
· #2200
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Looking for scan of middle 4 pages of RotaRule AA manual
PS: I found the advertisement again concerning the resonance frequency. It is inside here: https://sliderules.lovett.com/cookiedev/extendeddisplayarticle.cgi?match=w.richarddavisxxxjournaloftheoughtre
PS: I found the advertisement again concerning the resonance frequency. It is inside here: https://sliderules.lovett.com/cookiedev/extendeddisplayarticle.cgi?match=w.richarddavisxxxjournaloftheoughtre

By
Andreas Poschinger
· #2196
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Looking for scan of middle 4 pages of RotaRule AA manual
Mark, I think the sqrt(10) bug I have from this source: Richard Smith Hughes, John R. Dempster's RotaRule Model AA; A Masterpiece in the Art of Slide Rule Design; Journal of the Oughtred Society Vol.
Mark, I think the sqrt(10) bug I have from this source: Richard Smith Hughes, John R. Dempster's RotaRule Model AA; A Masterpiece in the Art of Slide Rule Design; Journal of the Oughtred Society Vol.

By
Andreas Poschinger
· #2195
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