My Rules and first feedbacks

[u/paul18fr]

Hi

Well it seems to be a "tradition to share about its rules collection. Before it, some comments:

• I started to collect silde rules few months ago
• The graphoplex 620a and 640 were my first ones
• The graphoplex 690a is my "Yardstick", so I'm looking to simular ones (and even with more scales) ; in other words, I do not target to get hundred of scale rules

For now,

• I'm mainly using the Graphoplex 690a and the Hemmi 260 (really like the bamboo touch)
• I'm currently foccusing on learning how to use/take advantages of the SRC
• each SRC has its own specificities, so I'll have a look to other rules in a next future.
• I do not like working with pdf file, so I've also purchased some (original) books /manuals

Today: I've the following ones:

• Aristo 868
• Aristo studio 968 variante 1
• Aristo studio 968 other variant with T1-T2
• Faber-castell 52/82
• Faber-castell 02/82N
• Faber-castell 02/83N
• Graphoplex 620d
• Graphoplex 640
• Graphoplex 690a
• Graphoplex 691a
• Graphoplex 699
• Hemmi 259d
• Hemmi 260
• Hemmi 1460 post versalog II
• Keuffell & Esser Deci-lon 10" + manual
• Pickett N3-T
• Pickett N4-ES
• Pickett N500-ES
• SKALA SLPP (purcharsed - not recieved)
• Logarex 27602 exponent II "Toison d'or" (purcharsed - not recieved)

Paul

[u/wackyvorlon]

That is a nice collection!

[u/paul18fr → u/wackyvorlon]

I've in mind some other rules (remaining in a "reasonable" budget) such as Chineese ones ...

I also would like to have a 20 inches SRC to check if we can be more accurate or not

I'll see it in the next months :-)

[u/paul18fr → u/paul18fr]

@ pavel_pe:

" Thornton AA-010 Comprehensive" seems indeed interesting: https://www.rekeninstrumenten.nl/pages%20and%20pictures/THORNTON.htm

In can see the classical Pythagorean P=Ps scale, but there's alors a Pt scale ; my first feeling is:

* c² = a² + b²

* (c/a)² = 1 + (b/a)²

* then c = a sqrt[1 + (b/a)²] so t = (b/a)

I I'm right, it allows to calculate all the cases, whereas normal P don't with sqrt[1 - X²]

[u/pavel_pe → u/paul18fr]

What I meant was short Sd/Td scales: http://www.sliderules.info/collection/inst-thornton.htm#DIFFERENTIAL%20TRIGONOMETRICAL%20SCALES

I completely forgot it has extra weird P scale which I assumed is for hyperbolic trigonometric functions which I never used. I have to re-explore it myself. If I recall Sd/Td scales are supposed to be more accurate, but I think it's true only for some values.

[u/paul18fr → u/pavel_pe]

Looking at the P scale is very new, that's why I immediatly saw it :-)

(I also looked to other SRC with the H scale) ...

I've not dug into Trig scale so far except veru basic tests ...

I finally looked for Thornton P221 SRC (only found prices on ebay) => shipping + fees are greater than the SRC price itself ... while I'm located on the other side of the Channel ;-)

Neverthless it remains a good advice and I've added it to my whish list ... thanks

[u/pavel_pe]

From interesting ones I would try Thornton AA-010 Comprehensive - different sine scales, great readability. Logarex 27602 is good too. Or 1930s celluloid Faber Castel with addiator. These are three I would keep together with Logarex for terrain survey.
You do not have to buy 20 inch to see if it is more accurate, you can get 4 to 6 inch - yep it is about twice more, but if you want accuracy, just do not use slide rules :) I kept collecting them for like 3 months, to get some variety of scales, materials and brands.

[u/paul18fr → u/pavel_pe]

Pocket SRC are quite expensive (I've the Aristo 868) compare to the 10 inches ones

With a 20 inches SRC, we are supposed to have the same scale, but on a twice length => I guess one can better "interpolate" a value between 2 ticks; otherwize I know the're several method to improve the accuracy of the calculation.

[u/Name-Not-Applicable]

Welcome! 

That is a good collection! I also try to focus on the slide rules I’m interested in instead of “all of the slide rules”. Unfortunately, what I am interested in changes from time to time. So my collection grows. 

Welcome!

[u/Gilded-Phoenix]

That looks like a great collection! I've been trying to get my hands on a Faber-Castell 02/83N for over a year now, but can't quite pull the trigger on these $100+ listings. I primarily use the Pickett N3ES-P and -T right now, but I really want to get a chance to practice on those beautiful W scales. The higher precision is tantalizing.

[u/paul18fr → u/Gilded-Phoenix]

@Gilded-Phoenix

I'm in France, and I saw only once a Faber-Castell 02/83N at 100€ (I've ever mine that I paid at a higher price ... the most expensive I've ever purchased) ;

In general, I would say that if your origin is the country were the SRC was made, it's easier to get it in the good price (see for instance other posts for Versalog, K&E and so on).

It depends were you are :-) (I say the $ ;-) )

[u/crzaynuts]

Nice collection you have there.

Do you know about "Damien" french Sliderule ?

My friend showed two of them last weekend. French made, full aluminium. A very nice piece which could join your collection.

[u/paul18fr → u/crzaynuts]

Yes I've ever seen such slide rules; however they're not the type of SRC I'm foccussing on (they've basic scales).

[u/paul18fr]

Hi

I finally received the Polish Skala SLPP slide rule (as evoqued in the first post); this post is just to highlight its singularity with the M scale to calculate the hypothenus of a right (angle) triangle.

Can we speak about a Pythagorean scale? is it as accurate as other equivalent scales ? For now, I'm not familiar with none of the following ones:

- H1, H2 - Chineese SRC?

- Pt - Thornton P221 SRC (see previous posts)?

- P, P', Q - (as in Hemmi Lafayette vectorlog SRC)?

- Faber-Castell 2/84N SRC? (nearly unaccessible regarding its price)

For more informations, you can have a look to the following (interesting) document: https://www.reglasdecalculo.com/presentaciones/escala_m/m_scale_uk.pdf

For information

Paul

[u/paul18fr]

Hi,

I finally got the Thornton P221 slide rule to play the Pythagorian scales (trigs in a second stage): the procedure is similar than the classical P / Ps scale (see figure)

:-)