Date   

Re: Dietzgen Rules

Rod Lovett
 

Hi Maciej,

Thank you but I'm looking specifically for information on Dietzgen rules.

Regards,

Rod

On 13-02-2021 13:14, Maciej M. Sysło wrote:
Hi Rod,
I have Overhead Projection Rules by FC and by Aristo in very good
conditions and with docs.
I have also Classroom Demonstration Ruler by FC, 2 m long.
Maciej
pt., 12 lut 2021 o 13:45 Rod Lovett <rod@lovett.com> napisał(a):

Hi All,
Does anyone have any details, good images, references etc., of
Classroom Demonstration Rules and/or Overhead Projection Rules
and/or Slide Projection Rules made by Dietzgen?
Regards,
Rod
--
http://mmsyslo.pl/
Wiki: https://pl.wikipedia.org/wiki/Maciej_Marek_Sysło [1]
Inicjatywa: http://mmsyslo.pl/godzina-kodowania/
Konkurs: http://www.bobr.edu.pl/
Olimpiady: https://www.oij.edu.pl/; https://www.oi.edu.pl/
Links:
------
[1] https://pl.wikipedia.org/wiki/Maciej_Marek_Sys%C5%82o
[2] https://groups.io/g/sliderule/message/1268
[3] https://groups.io/mt/80581866/2049020
[4] https://groups.io/g/sliderule/post
[5] https://groups.io/g/sliderule/editsub/2049020
[6] https://groups.io/g/sliderule/leave/defanged


Re: Dietzgen Rules

Maciej M. Sysło
 

Hi Rod,
I have Overhead Projection Rules by FC and by Aristo in very good conditions and with docs.
I have also Classroom Demonstration Ruler by FC, 2 m long.
Maciej

pt., 12 lut 2021 o 13:45 Rod Lovett <rod@...> napisał(a):

Hi All,

Does anyone have any details, good images,  references etc., of  Classroom Demonstration Rules and/or Overhead Projection Rules and/or Slide Projection Rules made by Dietzgen?

Regards,

Rod



Dietzgen Rules

Rod Lovett
 

Hi All,

Does anyone have any details, good images,  references etc., of  Classroom Demonstration Rules and/or Overhead Projection Rules and/or Slide Projection Rules made by Dietzgen?

Regards,

Rod


Anyone know of a Slide rule Manual put out by Boeing aircra?ft engineers

Daniel Say
 

 Anyone know of a Slide rule Manual put out by  Boeing aircraft engineers?

Our public library had it in the 1960s but long gone

I just want the description of the of the booklet,  Author, title, pagination year etc.

                           DanielSay@...




Re: Faber Castell 2/84 Mathema

meine
 

The FC 2/84 is a nice piece, but following the prices on ebay it is abit
out of my league -- just a bit ;-)

//meine

On Sun, Jan 24, 2021 at 05:45:50AM -0800, Rod Lovett wrote:
Good afternoon all, I have just received the following email.  Please contact François . directly if you are interested.

Regards,

Rod
===========================================================

Dear Mister Lovett
I do not collect slide rules and I own two Faber Castell 2/84, in very fine condition, never used, in their green hard box (which green "coating" itself suffered a little bit of its age).
Would you know any collector who would have an interest in purchasing one or both of them ?
Thank you in advance for your answer.
Best Regards from Paris-France,
François Granet
--
//meine


Re: Faber Castell 2/84 Mathema Thanks!

Charles Quinlan
 




On Sunday, January 24, 2021, 01:56:04 PM PST, Gabriel Vanderdonck <gv33858@...> wrote:


I think this one could give better results as it removes 2/84N.

https://sliderules.lovett.com/srsearch.cgi?string1=2%2F84+&string2=&string3=&string4=84+N&string5=%240&month=10&year=1999&R=Full&British=on

And don't forget to remove the lines without bids in order to get the real picture.

Best regards,

Gabriel


Re: Faber Castell 2/84 Mathema Also...

Gabriel Vanderdonck
 

I think this one could give better results as it removes 2/84N.

https://sliderules.lovett.com/srsearch.cgi?string1=2%2F84+&string2=&string3=&string4=84+N&string5=%240&month=10&year=1999&R=Full&British=on

And don't forget to remove the lines without bids in order to get the real picture.

Best regards,

Gabriel


Re: Faber Castell 2/84 Mathema Also...

Rod Lovett
 

On 24-01-2021 19:27, Charles Quinlan via groups.io wrote:
I am interested as well, as I have one, in great condition, but
without the "original" boxing, just the sleeve.
This is for insurance purposes since my insurance company is willing
to cover items of "unusual" value if they have an idea (other than my
own) as to the value.
Thanks, Charles
On Sunday, January 24, 2021, 08:02:05 AM PST, Maciej M. Sysło
<syslo@ii.uni.wroc.pl> wrote:
Hi Rod, ,could you estimate the price of FC 2/84
Best regards, Maciej
niedz., 24 sty 2021 o 14:45 Rod Lovett <rod@lovett.com> napisał(a):

GOOD AFTERNOON ALL,
I have just received the following email. Please contact _François
._directly if you are interested.
Regards,
Rod
===========================================================
Dear Mister Lovett
I do not collect slide rules and I own two Faber Castell 2/84, in
very fine condition, never used, in their green hard box (which
green "coating" itself suffered a little bit of its age).
Would you know any collector who would have an interest in
purchasing one or both of them ?
Thank you in advance for your answer.
Best Regards from Paris-France,François Granet
François Granet
fgranet@yahoo.fr
+33 625 911 277
--
http://mmsyslo.pl/
Wiki: https://pl.wikipedia.org/wiki/Maciej_Marek_Sysło [1]
Inicjatywa: http://mmsyslo.pl/godzina-kodowania/Konkurs:
http://www.bobr.edu.pl/
Olimpiady: https://www.oij.edu.pl/; https://www.oi.edu.pl/
Links:
------
[1] https://pl.wikipedia.org/wiki/Maciej_Marek_Sys%C5%82o
[2] https://groups.io/g/sliderule/message/1261
[3] https://groups.io/mt/80086123/2049020
[4] https://groups.io/g/sliderule/post
[5] https://groups.io/g/sliderule/editsub/2049020
[6] https://groups.io/g/sliderule/leave/defanged


Re: Faber Castell 2/84 Mathema Also...

Charles Quinlan
 

I am interested as well, as I have one, in great condition, but without the "original" boxing, just the sleeve.
This is for insurance purposes since my insurance company is willing to cover items of "unusual" value if they have an idea (other than my own) as to the value.

Thanks, Charles


On Sunday, January 24, 2021, 08:02:05 AM PST, Maciej M. Sysło <syslo@...> wrote:


Hi Rod, ,could you estimate the price of FC 2/84
Best regards, Maciej

niedz., 24 sty 2021 o 14:45 Rod Lovett <rod@...> napisał(a):
Good afternoon all,
I have just received the following email.  Please contact François .directly if you are interested.

Regards,

Rod
===========================================================

Dear Mister Lovett
I do not collect slide rules and I own two Faber Castell 2/84, in very fine condition, never used, in their green hard box (which green "coating" itself suffered a little bit of its age). 
Would you know any collector who would have an interest in purchasing one or both of them ?
Thank you in advance for your answer.
Best Regards from Paris-France,
François Granet
 
François Granet
fgranet@...
+33 625 911 277
 



--


Re: Faber Castell 2/84 Mathema

Maciej M. Sysło
 

Hi Rod, ,could you estimate the price of FC 2/84
Best regards, Maciej

niedz., 24 sty 2021 o 14:45 Rod Lovett <rod@...> napisał(a):

Good afternoon all,
I have just received the following email.  Please contact François .directly if you are interested.

Regards,

Rod
===========================================================

Dear Mister Lovett
I do not collect slide rules and I own two Faber Castell 2/84, in very fine condition, never used, in their green hard box (which green "coating" itself suffered a little bit of its age). 
Would you know any collector who would have an interest in purchasing one or both of them ?
Thank you in advance for your answer.
Best Regards from Paris-France,
François Granet
 
François Granet
fgranet@...
+33 625 911 277
 



Faber Castell 2/84 Mathema

Rod Lovett
 

Good afternoon all,
I have just received the following email.  Please contact François .directly if you are interested.

Regards,

Rod
===========================================================

Dear Mister Lovett
I do not collect slide rules and I own two Faber Castell 2/84, in very fine condition, never used, in their green hard box (which green "coating" itself suffered a little bit of its age). 
Would you know any collector who would have an interest in purchasing one or both of them ?
Thank you in advance for your answer.
Best Regards from Paris-France,
François Granet
 
François Granet
fgranet@...
+33 625 911 277
 


Re: Logarex 27608

Jerry McCarthy
 

Thank you Gabriel and Peter,

I have contacted the contact person on the second listed URL below.

I'll see what happens!


Regards, Jerry McCarthy, U.K.

On Thursday, 14 January 2021, 17:31:47 GMT, Gabriel Vanderdonck <gv33858@...> wrote:


Hi Jerry,

to add to what Peter wrote, you can have a look at http://logaro.cz/premiant-pleskot/

Or you can try to contact the guy on this page : https://log.sustr.net/log_navody.php
It seems he has the manual you are looking for and is open to share it with fellow collectors.

Best regards,

Gabriel


Re: Logarex 27608

Bob Adams
 

Many thanks Gabriel,

I have a 27608 and have been looking for the manual.

 

Cheers

Bob Adams

 

From: sliderule@groups.io [mailto:sliderule@groups.io] On Behalf Of Gabriel Vanderdonck
Sent: Friday, 15 January 2021 4:02 AM
To: sliderule@groups.io
Subject: Re: [sliderule] Logarex 27608

 

Hi Jerry,

to add to what Peter wrote, you can have a look at http://logaro.cz/premiant-pleskot/

Or you can try to contact the guy on this page : https://log.sustr.net/log_navody.php
It seems he has the manual you are looking for and is open to share it with fellow collectors.

Best regards,

Gabriel


Re: Logarex 27608

Gabriel Vanderdonck
 

Hi Jerry,

to add to what Peter wrote, you can have a look at http://logaro.cz/premiant-pleskot/

Or you can try to contact the guy on this page : https://log.sustr.net/log_navody.php
It seems he has the manual you are looking for and is open to share it with fellow collectors.

Best regards,

Gabriel


Re: Logarex 27608

Peter Holland
 

Hello Jerry,

Try to ask here:

http://logaro.cz/

LOGARO.CZ – Logaritmické pravítko

Regards,

Peter



Am 14.01.2021 17:44 schrieb "Jerry McCarthy via groups.io" <jerry_mccarthy_uk@...>:

Hi all,

I'm wondering if anybody might have a manual for the Logarex 27608 rule?

It can be in any language....


Thanks for reading,

Regards, Jerry McCarthy, U.K.


Logarex 27608

Jerry McCarthy
 

Hi all,

I'm wondering if anybody might have a manual for the Logarex 27608 rule?

It can be in any language....


Thanks for reading,

Regards, Jerry McCarthy, U.K.


File /Scales/Slide_Rule_Scale_Equations.txt uploaded #file-notice

sliderule@groups.io Notification <noreply@...>
 

The following files have been uploaded to the Files area of the sliderule@groups.io group.

By: Rick - WA6NDR

Description:
These equations generate the values shown on many slide rule scales. Understanding them helps understand why various slide rule procedures work.


Re: Graphoplex Electric log log and others: Development of scale arrangement

Andreas Poschinger
 

Dear Fabrice and all other friends of Graphoplex,

hm. Séjourné inventor of the 640 or not?  I uploaded
https://groups.io/g/sliderule/files/scaleArrangements/Sejourne.png which
can be found in articles from Daniel TOUSSAINT in the net. According to
this Séjourné somehow applied for a patent on a slide rule which makes
it likely that he is somehow behind the 640. I've looked at the European
Patent Office whether I can find it, but I couldn't. Does somebody know
anything more?

Regardless whether Séjourné developed the 640 or somebody else I guess
I've understood now, how the scales did evolve:

The Darmstadt got known in France having P on Body and LL1-LL3 on slide.
Tavernier-Gravet seemingly produced it in war time.

The Electro was also known in France. Tavernier-Gravet produced it pre
war and with S bound to D. They also produced Rietz and of course Mannheim.

Coming from Mannheim, Rietz and Electro, all backward compatible in use,
it was straight forward to add LL1 on the body of the Electro. This is
supported by that they called it "system" Electro Log Log. But where to
add P? According to the manual the biggest advantages are to see cos and
sin at the same time and to achieve higher precision. Using the slide
un-flipped one would set an angle at the sin scale, needed to turn
around the rule and read the sin of tha angle on C at D10. This means
they had to put the P scale on the front of the slide if they wanted to
read both values at the same time. But if for precision the angle should
be again set in cos direction the rule needed to be turned and then
turned again. To avoid this they had either to put P and S on the front
of the slide resulting in 5 scales (too many and having tan on the
back...) or to put C S and P on the back of the slide (together with tan
then 4 scales). So from that point of view the solution of the early 640
is straight forward.  And they even achieved the advantage that when
flipping the slide everything still works and even normal proportions
without Trig can be done.

But now how P moved on body: André Séjourné preferred the proportions
and took it into account that the result is read on C.

When having now the hypotenusis as e.g. 8 and knowing that cos phi =
0.8. How to find both catheti? (Electricians detect cos(phi) not phi...)

Then according to Séjourné it is straight forward to write 8/1 =
cathetus1/0.8=cathetus2/sqrt(1-0.8^2)

Set C8 on D10, read cathetus1 on C at D0.8 and cathetus2 on C at P0.8

So having P on body perfectly supports Séjourné's way of thinking and
moving it on the body they got space for ST... Fabrice, can you confirm
this based on your reading of  "Technique nouvelle de la Règle à Calculs
par la Généralisation de la notation opératoire"?

Anything lost?

Best regards

Andreas


Re: Graphoplex Electric log log and others: Development of scale arrangement

Andreas Poschinger
 

Dear Fabrice,

in Frensh wikipedia there is (without reference so far I've seen):

Vers 1950, André Séjourné, professeur en classe préparatoire aux Arts et Métiers au lycée Voltaire à Paris, perfectionne la règle à calcul normale en lui adjoignant les échelles LL1, LL2, LL3. C'est la règle à calcul Log-Log. Il est conseil auprès de la société Graphoplex pour la création de ses premières règles.

Les échelles Log-Log étaient déjà connues dans l'entre-deux-guerres, règle « Electro » avec LL2 et LL3 dès les années 1920, règle « Darmstadt » avec LL1, LL2 et LL3 en 1935. André Séjourné diffusa l'« Electro Log Log » (Graphoplex 640), qui ne fut utilisée pratiquement qu'en France.

In German wikipedia I wrote:

Der um 1950 von Prof. André Séjourné entwickelte Graphoplex 640 besitzt auf der Rückseite der Zunge eine zweite C-Skala, sodass bei umgedrehter Zunge alle Rechnungsarten möglich sind, ohne den Rechenstab wenden zu müssen; dabei muss lediglich auf die CI- und die B-Skala verzichtet werden[14].

I referenced http://www.elemathique.com/regle_a_calcul.php which contains this:

Vers 1950, le professeur André Séjourné peaufina la règle à calcul normale en lui adjoignant les échelles LL1, LL2, LL3. Ce fut la règle à calcul Log-Log. Les échelles Log-Log étaient déjà connues dans l'entre deux guerres, Règle "Electro" avec LL2 et LL3 dès les années 20, Règle "Darmstadt" avec LL1, LL2, LL3 en 1935. André Séjourné diffusa l'"Electro Log Log" (Graphoplex 640). Les Français sont les seuls à avoir utilisé cette Electro Log Log

This seems to be a copy of Frensh wikipedia. This version remembers a little in the old German wikipedia version where there was a sentence with Prof. Walter for the Darmstadt as in the Frensh for Séjourn.

I am afraid that is a typical case where wikipedia cites now something which comes from wikipedia.

With your statement there is no evidence so far that Séjourné did invent scale layouts. I throw it out from German wikipedia within the next time.

Best regards

Andreas


Am 09.12.2020 um 18:20 schrieb Fabrice Bouillerot via groups.io:

Hello Andreas,

> Le lundi 30 novembre 2020 à 21:36:04 UTC+1, Andreas Poschinger <andreas.poschinger@...> a écrit :
>
> In your last email:
> "In conclusion, as soon as the value of sinβ is determined, obtaining 
> the value of sinβ x m / n is obtained in a single rule movement."
> So I can understand it that sinβ must be read first on the backside of 
> the slide rule nd then transferred to another scale just if it would be 
> an expression a m / n. No other sophisticated method.

A short answer to your question is yes.
As soon as you got the value of sinβ, the calculation is reduced to a 
simple proportion calculation. 

> It would be fine to look whether there is a hint in his book how things 
> would change if the back of the slide had an additional C scale.

Thanks to you, I spent a good time to read again entirely this book, 
so here is my humble opinion.

In the book «Technique nouvelle de la Règle à Calculs par la Généralisation de la notation opératoire» André Séjourné tries to decouple the different models of arrangement of scales on slide rules, to favor a purely proportional method.

He is not interested in a possible modification of the arrangement of the scales whatever the type of slide rule is.

His method is also effective for "mechanically" (with ease, automatically) determining the order of magnitude of the result.
 
It also allows all kinds of combinations between scales with different modules.
(for example x, x², x³, or x⁻¹, x⁻², x⁻³)

So improving, or changing, scales arrangment is not the topic of this book, it shows a way to use slide rule whatever scales arrangment you have.


"Slideruly Yours"

Fabrice Bouillerot



Re: Graphoplex Electric log log and others: Development of scale arrangement

Fabrice Bouillerot
 

Hello Andreas,

> Le lundi 30 novembre 2020 à 21:36:04 UTC+1, Andreas Poschinger <andreas.poschinger@...> a écrit :
>
> In your last email:
> "In conclusion, as soon as the value of sinβ is determined, obtaining 
> the value of sinβ x m / n is obtained in a single rule movement."
> So I can understand it that sinβ must be read first on the backside of 
> the slide rule nd then transferred to another scale just if it would be 
> an expression a m / n. No other sophisticated method.

A short answer to your question is yes.
As soon as you got the value of sinβ, the calculation is reduced to a 
simple proportion calculation. 

> It would be fine to look whether there is a hint in his book how things 
> would change if the back of the slide had an additional C scale.

Thanks to you, I spent a good time to read again entirely this book, 
so here is my humble opinion.

In the book «Technique nouvelle de la Règle à Calculs par la Généralisation de la notation opératoire» André Séjourné tries to decouple the different models of arrangement of scales on slide rules, to favor a purely proportional method.

He is not interested in a possible modification of the arrangement of the scales whatever the type of slide rule is.

His method is also effective for "mechanically" (with ease, automatically) determining the order of magnitude of the result.
 
It also allows all kinds of combinations between scales with different modules.
(for example x, x², x³, or x⁻¹, x⁻², x⁻³)

So improving, or changing, scales arrangment is not the topic of this book, it shows a way to use slide rule whatever scales arrangment you have.


"Slideruly Yours"

Fabrice Bouillerot


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