Hello all,does anyone know a manufacturer who used a semicircular glass cylinder, on the back as a magnifying glass before 1900?Kind regards,Andreas

Hi,I interpret Rods questions also like do we really need inverse LL scales?From my point of view not necessarily. In most practical cases I knowabout the use of LL scales ...

Hi,this part is now about the use for logarithms for numbers smaller than1, that I've almost forgot.I still teach Bode (though in my practical time never applied) with theamplidude response ...

Hi,indeed I lost at least one use case: logarithms of numbers smaller than1. This I will put into part 5. Any other use cases lost?Hyperbolic functions are of some importance ...

Hi,the third application is the computation of expressions containinge^(-t/T), especially the calculation of tables of values for thesefunctions. For this application the inverse loglog scales are notnecessarily needed, but make ...

Hi,I've forgot to mention arbitrary powers of numbers smaller than onewhich is maybe the most obvious use in most instructions.Let's look on 15*(0.5^3).If we only have LL1-LL3 then we need ...

PS: Ive meant I hope that I do not bore you.... ... allready late;technically it is hopefully ok!-) Good night!Am 18.05.2022 um 22:09 schrieb Andreas Poschinger:

Hi,I hope that I not borrow, since by sure all can be also read in manuals.The most simpliest use of inverse LogLog scales together with nomalLogLog scales are absolute inverse ...

Hi Rod,today I have an online meeting. I will write something together the nextdays. The mean usages for me right now are:Inverse numbers in their precise value without taking care ...

Hi Andreas,I was merely interested in the uses for an inverse log log function.Regards,Rod

Hi Rod,to be honest, when flying over the paper I did not find the point in thepaper other that somehow the invention history of the inverse Loglogscales is described. Did ...

Hi Andreas,I think that you are correct.I hadn't associated the "i" with inverse.Now I would like to see some useful applications of these ideas!Best wishes,Rod

PS: I found in your literature search an article:Author    Bob OtnesTitle    Log Log Scales - RevisitedLocation    Journal of the Oughtred Society Vol. 4, No. 1, March, 1995 Pg 9This fits ...

Hi Rod,I did not look into the old messages (due to time restriction...); thismay however senseful to solve the puzzle in order to know what Bob hastriggert to write this.May ...

Hello Everyone,Back in 2006 ( ISRG #29477 ) Bob Otnes (sadly no longer with us) wrote the following:Seeing the current interest in logs and cologs, it might be that somereaders ...

I must add that, while the discs are connected front to back, there doesn't appear to be any useful way to chain calculations from front to back. In any case, ...

The Dempster RotaRule model 'A' and model 'AA'  circular slide rules have a single central disk that is functional on both the front and back of the rule. These slide ...

I just got in a Concise 300 as my first duplex circular slide rule.  The front and back center discs on this one move independently.  I was wondering if there ...

Hi Steve,Thank you for taking the time to scan and upload the S.I.C. 1610 manual. I really appreciate it.Best regards,Eamonn.

StephenK <thekays100@...> added folder /S.I.C. 1610 Manual