
Magnifying glass on the backside of a simplex slide rule pre 1900
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
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

By
Andreas Faßbender
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Use of Inverse LogLog scales First resume
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 know about the use of LL scales as replacement is almost
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 know about the use of LL scales as replacement is almost

By
Andreas Poschinger
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Use of Inverse LogLog scales Part 5: Logarithms
Hi, this part is now about the use for logarithms for numbers smaller than 1, that I've almost forgot. I still teach Bode (though in my practical time never applied) with the amplidude response be cal
Hi, this part is now about the use for logarithms for numbers smaller than 1, that I've almost forgot. I still teach Bode (though in my practical time never applied) with the amplidude response be cal

By
Andreas Poschinger
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Use of Inverse LogLog scales Part 4: Hyperbolic functions
Hi, indeed I lost at least one use case: logarithms of numbers smaller than 1. This I will put into part 5. Any other use cases lost? Hyperbolic functions are of some importance in transmission line p
Hi, indeed I lost at least one use case: logarithms of numbers smaller than 1. This I will put into part 5. Any other use cases lost? Hyperbolic functions are of some importance in transmission line p

By
Andreas Poschinger
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Use of Inverse LogLog scales Part 3: Expressions containing e^(t/T)
Hi, the third application is the computation of expressions containing e^(t/T), especially the calculation of tables of values for these functions. For this application the inverse loglog scales are
Hi, the third application is the computation of expressions containing e^(t/T), especially the calculation of tables of values for these functions. For this application the inverse loglog scales are

By
Andreas Poschinger
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Use of Inverse LogLog scales Part 2: Arbitrary powers of numbers small than one
Hi, I've forgot to mention arbitrary powers of numbers smaller than one which is maybe the most obvious use in most instructions. Let's look on 15*(0.5^3). If we only have LL1LL3 then we need to calc
Hi, I've forgot to mention arbitrary powers of numbers smaller than one which is maybe the most obvious use in most instructions. Let's look on 15*(0.5^3). If we only have LL1LL3 then we need to calc

By
Andreas Poschinger
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Use of Inverse LogLog scales Part 1: Absolute inverse numbers 2 messages
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 nomal LogLog scales are absolute inverse numbers. Absolute, b
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 nomal LogLog scales are absolute inverse numbers. Absolute, b

By
Andreas Poschinger
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lologs and ilologs 7 messages
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 some readers would be interested
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 some readers would be interested

By
Rod Lovett
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Do any duplex circular slide rules have the front and back center disc connected? 3 messages
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 are any circular models where the front and
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 are any circular models where the front and

By
dpressnall@...
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Added Folder /S.I.C. 1610 Manual 2 messages
#filenotice
StephenK <thekays100@...> added folder /S.I.C. 1610 Manual
StephenK <thekays100@...> added folder /S.I.C. 1610 Manual

By
sliderule@groups.io Notification
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SIC 1610D 3 messages
Hi, Can anyone point me to a scan/PDF of the manual for the SIC 1610D slide rule? Thanks, Eamonn.
Hi, Can anyone point me to a scan/PDF of the manual for the SIC 1610D slide rule? Thanks, Eamonn.

By
Eamonn
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The Arithmeum, Bonn, Germany.
If anybody happens to be in Bonn in a couple of weeks time, these were just advertised in the Newsletter des Arithmeums: Sonntag, 15. Mai 2022 Internationaler Museumstag  Eintritt frei!  Museum nur
If anybody happens to be in Bonn in a couple of weeks time, these were just advertised in the Newsletter des Arithmeums: Sonntag, 15. Mai 2022 Internationaler Museumstag  Eintritt frei!  Museum nur

By
Jerry McCarthy
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Diwa expert 3 messages
Hi Togehter, is there a Diwa expert reading along here? The Pi symbol used by Diwa looks very similar to the early Albert Nestler Pi. Coincidence, or did the designer like it so much that he adopted i
Hi Togehter, is there a Diwa expert reading along here? The Pi symbol used by Diwa looks very similar to the early Albert Nestler Pi. Coincidence, or did the designer like it so much that he adopted i

By
Andreas Faßbender
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United Kingdom Slide Rule (UKSRC) Gazette
Good morrow everyone, For over twenty year our UKSRC Gazette has been annually providing interesting and varied articles for the slide rule community and we are delighted with our many authors who, ye
Good morrow everyone, For over twenty year our UKSRC Gazette has been annually providing interesting and varied articles for the slide rule community and we are delighted with our many authors who, ye

By
Rod Lovett
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K&E Mystery Rule
I recently purchased an unusual K&E rule from eBay. Here is a link to the auction: https://www.ebay.com/itm/255451676644 It’s a K&E ‘mystery’ rule. This one is essentially a K&E N40533, but with no m
I recently purchased an unusual K&E rule from eBay. Here is a link to the auction: https://www.ebay.com/itm/255451676644 It’s a K&E ‘mystery’ rule. This one is essentially a K&E N40533, but with no m

By
Eamonn
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Small Collection of Aristo Slide Rules for Sale 5 messages
Hi I have a small collection of Aristo Slide Rules for sale. Most are Studon of one sort or another, and a few Faber Castel I have had these for may years, and all are in good clean condition, some ar
Hi I have a small collection of Aristo Slide Rules for sale. Most are Studon of one sort or another, and a few Faber Castel I have had these for may years, and all are in good clean condition, some ar

By
chris
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Ecobra Darmstadt Spezial R143 respectively Jakar 22 5 messages
Hi, another question about Fuji slide rules; I have a Ecobra Darmstadt Spezial R 143, identical to Jakar 22. However seemingly it is glued together in a non parallel way. The slide rule seemingly cons
Hi, another question about Fuji slide rules; I have a Ecobra Darmstadt Spezial R 143, identical to Jakar 22. However seemingly it is glued together in a non parallel way. The slide rule seemingly cons

By
Andreas Poschinger
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Faber Multitrig and Elektro Special 2 messages
Hi, I wonder whether the slides of the small Faber plastics simplex models are exchangeable. If the Rietz slide woud fit in Faber Electros and/or Faber Darmstadt then it would be possible to "create"
Hi, I wonder whether the slides of the small Faber plastics simplex models are exchangeable. If the Rietz slide woud fit in Faber Electros and/or Faber Darmstadt then it would be possible to "create"

By
Andreas Poschinger
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The DI Scale / Calculating parallel resistors by factoring out without DI scale and result on D / Vector calculation with SI TI 12 messages
Hi, revisiting again an old thread. Back in July I poposed the DI scale for calculating the resistor of two parallel resistors:  old message part Assume to have two resistors in paral
Hi, revisiting again an old thread. Back in July I poposed the DI scale for calculating the resistor of two parallel resistors:  old message part Assume to have two resistors in paral

By
Andreas Poschinger
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Regluing flying fishes
Hi, I do not know whether I ever wrote it here, but do to my Ecobra 143 problem I remembered. Some ys ago I've got a Flying Fish 1003 with an endbar glued the wrong way and later a black 1200 with an
Hi, I do not know whether I ever wrote it here, but do to my Ecobra 143 problem I remembered. Some ys ago I've got a Flying Fish 1003 with an endbar glued the wrong way and later a black 1200 with an

By
Andreas Poschinger
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