Slide rules are a major area of interest for serious collectors of
scientific & mathematical calculators. Here is a necessary addition to
any collection of slide rules.

Here is a major compendium of nearly all slide rule patents issued
worldwide: over 1000 PDF files present full, printable images of over
900 patents, searchable on any computer by patent number, date of
issue, & inventor's name. In addition, US patents are arranged by
patent class.

In addition, over 200 of the patents on this CD are of foreign origin.

Also included are selected patents on portable nomographic, linear &
chart calculators, as well as other calculators relying on opposable
logarithmic scale technology. Graphical calculators for trigonometric
calculations are also included.


Jack

People (???)

Is this a functioning group?

The activity level seems to be a good approximation of Zero. I note
there have been 16 postings since August. I belong to groups where I
recieve more than that a DAY.

Is the word "beauty" too scary? And "forums" are places where people
discuss things, and have at least since Roman times.

Am I in the wrong place if I want to speak of the "Queen of my modist
collection", and perhaps some NEW algorithic tricks I have come up with
for her to perform...


Leo

--- In slideruleforum@yahoogroups.com, "br2hughes" <br2hughes@...>
wrote:
>
> People,
>
> I have recently taken an enormous interest in slide rules.  > main
question(s):  Does anyone know if I am alone in my slide rule...
> ..... or must I be the sole person to ensure
> that future generations don't lose sight of this wonderful instrument?
>
> I am very curious to here about any responses.
>
> Brandon Hughes
> br2hughes@...
>
Brandon:

You are a rare bird, but not alone. I have a student here at a
technical university in Finland who uses a slide rule. I was the one
who interested him in them and taught him the use of it.

I too am a newcomer to the group, but I am nearly three times your age
(!!!). I was attracted to the group by the words "utilitarian BEAUTY of
the slide rule". I am not really a collector, but more or less run a
home for orphan slide rules.

My concern with them these days is with their beauty. Not just as
objects (although many are beautiful) but with the mathematical beauty
of the things. One of my passtimes is to make an arbitrary setting and
them work out all the possible implications of that setting. (It is
possible to find a large number of + and - powers of numbers without
using LL scales.)

I would really advocate returning the use slide rules in schools. If
one really understands WHY a slide rule works, you have a conceptual
edge on others in understanding how the number system works (Why are
negative exponents defined the way they are? Meditation on a slide rule
will tell you on a deep level.)

What kind of rule(s) do you use? The queen of my modest collection is a
classic Hemmi 260 that I bought in 1960.

Leo

br2hughes wrote:
>
> People,
>
> I have recently taken an enormous interest in slide rules. I
> graduated last year with a B.A. in Math and Physics and have since
> studied some mechanical engineering in graduate program. Having found
> my fellow students heavily engulfed in the need to use current
> technology to solve problems (like using Maple and Matlab to integrate
> relatively simple functions), I am feeling alone in my passion for the
> more theoretical aspects of the subjects, of science.
>
> Perhaps there's even a sense of disgust toward the use of computers
> and calculators growing within me. I'm not sure. But I acknowledge
> that the other students I know don't sympathize with me; they are
> merely interested in the solution to a problem, rather than the
> delicate and beautiful process of getting there. I believe these
> preliminary steps are of utmost importance. This is one of several
> reasons why I've chosen to become skilled in the mastery of the
> slide. Of course, I, too, share in those reasons commonly discussed
> by slide rule fanatics such as yourselves.
>
> I have just turned 23 years old, and I know of no one even remotely
> close to my age that currently uses a slide rule as I do. Now to my
> main question(s): Does anyone know if I am alone in my slide rule
> endeavors for my age bracket, or must I be the sole person to ensure
> that future generations don't lose sight of this wonderful instrument?
>
> I am very curious to here about any responses.
>
> Brandon Hughes
> br2hughes@... <mailto:br2hughes%40aim.com>
>
>
Brandon,
     I'm 48, have been an engineer for 26 years and have seen a lot of
technology developed in that time.  Useful electronic calculators were
just coming out as I was in high school.  I was one of the last who were
introduced to slide rules in engineering orientation class.  But, I,
like you, think that John Napier and those who followed were brilliant
men, far more than we are today.  To be able to multiply by adding!!
Yes, I have a couple of 6 inch slide rules that I consistently use for
simple calculations (gas mileage, for example).  The fact is, for real
engineering, my $10 Casio calculator is much faster, more precise,
easier to use, less chance of a mistake than a 10" slide rule.  So, when
I want to find an answer, I use a calculator.  When I want to marvel at
the beauty of numbers, I go to the slide rule.

Preston


[Non-text portions of this message have been removed]

Hi Brandon,
   I think it is wonderful that you have taken up the SR. Yes, I agree, it is
probably rare ( unfortunately ) at your age. Actually, I think it is pretty rare
at any age. Of course, all of us here have a great passion for SRs, but just
look around the real world. Most are in drawers, "somewhere in the attic" etc.
   Have you been able to find good teaching sources / books ?
What SRs do you have now ?

  Gary

   ----- Original Message -----
   From: br2hughes
   To: slideruleforum@yahoogroups.com
   Sent: Thursday, February 22, 2007 5:25 AM
   Subject: [Slide Rule Forum] Anyone my age (23) using a Slide Rule?


   People,

   I have recently taken an enormous interest in slide rules. I
   graduated last year with a B.A. in Math and Physics and have since
   studied some mechanical engineering in graduate program. Having found
   my fellow students heavily engulfed in the need to use current
   technology to solve problems (like using Maple and Matlab to integrate
   relatively simple functions), I am feeling alone in my passion for the
   more theoretical aspects of the subjects, of science.

   Perhaps there's even a sense of disgust toward the use of computers
   and calculators growing within me. I'm not sure. But I acknowledge
   that the other students I know don't sympathize with me; they are
   merely interested in the solution to a problem, rather than the
   delicate and beautiful process of getting there. I believe these
   preliminary steps are of utmost importance. This is one of several
   reasons why I've chosen to become skilled in the mastery of the
   slide. Of course, I, too, share in those reasons commonly discussed
   by slide rule fanatics such as yourselves.

   I have just turned 23 years old, and I know of no one even remotely
   close to my age that currently uses a slide rule as I do. Now to my
   main question(s): Does anyone know if I am alone in my slide rule
   endeavors for my age bracket, or must I be the sole person to ensure
   that future generations don't lose sight of this wonderful instrument?

   I am very curious to here about any responses.

   Brandon Hughes
   br2hughes@...





[Non-text portions of this message have been removed]

I reckon I am supposed to do this prior to contacting members in the slide rule
group.

Brandon



________________________________________________________________________________\
____
Get your own web address.
Have a HUGE year through Yahoo! Small Business.
http://smallbusiness.yahoo.com/domains/?p=BESTDEAL

[Non-text portions of this message have been removed]

People,

I have recently taken an enormous interest in slide rules.  I
graduated last year with a B.A. in Math and Physics and have since
studied some mechanical engineering in graduate program.  Having found
my fellow students heavily engulfed in the need to use current
technology to solve problems (like using Maple and Matlab to integrate
relatively simple functions), I am feeling alone in my passion for the
more theoretical aspects of the subjects, of science.

Perhaps there's even a sense of disgust toward the use of computers
and calculators growing within me.  I'm not sure.  But I acknowledge
that the other students I know don't sympathize with me; they are
merely interested in the solution to a problem, rather than the
delicate and beautiful process of getting there.  I believe these
preliminary steps are of utmost importance.  This is one of several
reasons why I've chosen to become skilled in the mastery of the
slide.  Of course, I, too, share in those reasons commonly discussed
by slide rule fanatics such as yourselves.

I have just turned 23 years old, and I know of no one even remotely
close to my age that currently uses a slide rule as I do.  Now to my
main question(s):  Does anyone know if I am alone in my slide rule
endeavors for my age bracket, or must I be the sole person to ensure
that future generations don't lose sight of this wonderful instrument?

I am very curious to here about any responses.

Brandon Hughes
br2hughes@...

--- In slideruleforum@yahoogroups.com, "Frank Carson" <traff11@...>
wrote:
>
> Just a fun and question for the group:
>
> What was in your pocket protector?  What did you carry - what did you
find "essential" to have for day-to-day work?  Even if you didn't use a
pocket protector - what did you carry around with you at work?
>
> Again, just a fun question...
>
> Frank Carson
>
> [Non-text portions of this message have been removed]
>
Brings back memories.....I had my Rapidograph pen, A Parker ink pen, a
mechanical pencil and probably a little metal tin of pencil leads for
my mechanical pencil. Also a very used lead pencil too.
Thanks for the memories.
Ross Harp

Hi Group,

OK...I'll fess up and admit I used to wear one diligently in my shirt
pocket.  I carried a mechanical pencil and a ballpoint pen in my
pocket protector.  But mainly, I wore a pocket protector because
there was a clear plastic sleaave attached to it where I inserted my
company badge.  I worked in a place where we required a security
clearance and we had to display our badge at all times.  I know there
are more plastic-pocket-protector users out there...come out and show
yourselves!

Amin
Norman OK

--- In slideruleforum@yahoogroups.com, "Frank Carson" <traff11@...>
wrote:
>
> Just a fun and question for the group:
>
> What was in your pocket protector?  What did you carry - what did
you find "essential" to have for day-to-day work?  Even if you didn't
use a pocket protector - what did you carry around with you at work?
>
> Again, just a fun question...
>
> Frank Carson
>
> [Non-text portions of this message have been removed]
>

Just a fun and question for the group:

What was in your pocket protector?  What did you carry - what did you find
"essential" to have for day-to-day work?  Even if you didn't use a pocket
protector - what did you carry around with you at work?

Again, just a fun question...

Frank Carson

[Non-text portions of this message have been removed]

Goodmorning,

I would like to buy the following slide rules:

-HEMMI 256     + manual
-HEMMI 257L    + manual
-HEMMI 266     + manual
-HEMMI 269     + manual
-one glass for HEMMI 259

I have seen diffrent prices but since I am new of this brand I ask
suggestions about where buy them.

Best Regards
timoleonte_66



PS I hope this message is not against the rules of the slideruleforum.

Hi, I am desperate to see the instructions for the Aristo 0901 "Junior"
slide rule.  I am confused with how to use the 'v' line on the cursor
against the K (x3) scale.  I am also not so sure about the other
functions of the other cursor lines.  Any help greatly appreciated.

Thanks

Hello All,

I'd like to buy an Aristo No. 0971 slide rule with case and
accessories, in good or better condition.  Thanks.

Sincerely,
Amin

Hello Chuck,

Those models sound correct for that timeframe.  I've seen both models
on ebay recently.  There are lots of people with whom you can deal
directly.  The best place to look, in my humble opinion, is to start
with The Oughtred Society home page (www.oughtred.org).  From there,
you can find just about anything and everything to may want to know
about slide rules.  Contact me again if you have any more questions.
I can point you in the right direction, in most cases.  Take care.

Sincerely,
Amin
Norman OK USA

--- In slideruleforum@yahoogroups.com, Chuck Taylor <astro@...> wrote:
>
> Nostalgia has struck and I'm looking to replace my first slide
> rules. The originals disappeared years ago. I think I have
> identified the model numbers, but if someone who knows the
> models can confirm they were available those years, I would
> appreciate it.
>
> The first was purchased September 1970 and I believe it was a
> Post 1447 with gray hard case. That model looks right, but I
> was unable to find anywhere that had the model numbers and the
> years they were made.
>
> The second was issued at West Point in September 1974. I
> believe it was a K+E 68-1100 with orange leather case and tan
> hardcover manual. Do I have the right model for that time?
>
> Thanks
>
> Chuck
>

Nostalgia has struck and I'm looking to replace my first slide
rules. The originals disappeared years ago. I think I have
identified the model numbers, but if someone who knows the
models can confirm they were available those years, I would
appreciate it.

The first was purchased September 1970 and I believe it was a
Post 1447 with gray hard case. That model looks right, but I
was unable to find anywhere that had the model numbers and the
years they were made.

The second was issued at West Point in September 1974. I
believe it was a K+E 68-1100 with orange leather case and tan
hardcover manual. Do I have the right model for that time?

Thanks

Chuck

Does anyone have a short body bar for a post 1460 for sale?

I am interested please forward details

TENGO UN LOTE DE REGLAS DE CALCULO TOTALMENTE NUEVAS, CON EMPAQUE
ORIGINAL,ALGUNAS CON ESTUCHE Y/O MANUAL,SON ARISTO, FABER
CASTELL,MARCANTONI Y ECOBRA. INTERESADOS DOY MAS DATOS.

I HAVE A LOT OF SLIDE RULES FOR SALE, NO USED FULLY, WITH ORIGINAL
PACKAGE, SOME WITH LEATHER CASE AND/OR INSTRUCTION MANUAL,ARISTO,FABER
CASTELL, MARCANTONI AND ECOBRA, VARIOUS MODELS, IF YOU ARE INTERESTED,
I WILL GIVE YOU MORE DETAILS.BEST REGARDS.

I came across a Sterling 594, Decimal Trig, Log-Log, all plastic in
grey back-clear front slip case with instruction manual.

what can anyone tell me about it?

thanks, from
greenportsalty

--- In slideruleforum@yahoogroups.com, "atasker99" <amtasker@...> wrote:
>
> You'll be interested to know that, on May 25 at 16.00 PDT,, my Analon
+
> case + manual + guarantee + care instructions will go up as Item
number
> 6282810117.  Low starting price to encourage bidding.  Good Luck.
> GreenportSalty (and the fishing is good already!)
>
Well, it went for a Buy-it-Now price of $799.99 in about 1.5 hours!

You'll be interested to know that, on May 25 at 16.00 PDT,, my Analon +
case + manual + guarantee + care instructions will go up as Item number
6282810117.  Low starting price to encourage bidding.  Good Luck.
GreenportSalty (and the fishing is good already!)

Hello to everybody,

I'm a new member living in Spain and I own -from my grandfather- a No
7 Nestler Kaüfmannischer . Rechenschieber slide rule

The scales are q% Z - T M D%-  K L
In the reverse L S d (for Pounds, Shillings and pennies I suppose)

In the rear of the slide there are tables of equivalence in french

I'd like any information concerning this rule

Thank you very much

Badoro

PD I need also a manual for the Aristo 0906LL in english, french or
spanish language

Another of those personality tests. This was fun. Check it out.

               sxinglan,

   Your GQ (geek quotient) is Above average.


   Your geekiness is in the normal range.

   You're more geeky than 68% of all people of your age group and sex.

   You're comfortable when you socialize with other geeks.

   Click here to take the GQ test.





---------------------------------
New Yahoo! Messenger with Voice. Call regular phones from your PC and save big.

[Non-text portions of this message have been removed]

Has a great article "When Slide Rules Ruled" by Cliff Stoll.

--- In slideruleforum@yahoogroups.com, "s_vaidehi_24"
<s_vaidehi_24@...> wrote:
> I found this piece of information on Internet. It is wonderful.
> Today I am going to describe divisibility of a number by 13.
[snipsnip]
> I hope you would enjoy this.
> S Vaidehi

Well, yes, it is enjoyable, although not really SR related.

The algorithm was offered without proof, which I would
like to show as follows:

Let the "original" number be represented as 10a + b,
where b is the last digit, and 10a represents all the other
digits.

Assume that 10a + b is divisible by 13, in which case
10a + b = 13k where k is some integer.

Then b = 13k - 10a

The effect of the algorithm as described is to produce a + 4b

a + 4b = a + 4(13k - 10a)
        = a + 52k - 40a
        = 52k - 39a

Given that k and a are both integers, and both 52 and 39 are
divisible by 13, we therefore end up with a new number which is
divisible by 13, assuming that 10a + b was divisible by 13
in the first place.

Regards, Jerry McCarthy, U.K.

--- In slideruleforum@yahoogroups.com, "Amin Aur" <amin_aur@...> wrote:
>
> Hello All,
>
> I'm looking for a Lafayette 99-7055 slide rule with case and, if
> possible, a manual, all in good to excellent condition.  Thanks and
> Happy New Year.
>
> sincerely,
> Amin
>
Hi All,

I found a slide rule and case, both in near mint condition, with a
manual.  If anyone looked for one for me...thanks.

A

I found this piece of information on Internet. It is wonderful.

=============================================================
Dear Friends,
Today I am going to describe divisibility of a number by 13. In
schools and coaching institutes students are taught divisibility of a
number by 2, 3, 4, 5, 6, 8, 9 and 11. I hope you are all aware of this.
A number will be divisible by 2, if it is an even number.A number will
be divisible by 3, if sum of the digits is divisible by 3 and so on
and so fourth... But what about 7, 13, 17, 19 and other odd numbers?
Our contemporary mathematics is silent on this. In Vedic Mathematics
we have solutions for all these (surprised?)
Let me introduce 13. [Operator of 13 is 4 How?** ]
Find whether 1001 is divisible by 13?
By seeing it is difficult to say.
Do the following operations:
1001= 100+1(last digit)*4(operator)= 104= 10+ 4 (last
digit)*4(operator)=26
Since 26 is divisible by 13 therefore, 1001 is divisible by 13.
What have we done here?
We seperated the last digit of the number, multiplied it by the
operator and added the result to the rest. This we did until we found
a managable number. Go ahead and test this!
Pradeep Kumar
Chief Trainer (Magical Methods)
B. Tech, MBA (IIM Bangalore)
www.magicalmethods.com

===========================================================

I hope you would enjoy this.

S Vaidehi

My father always said that _Calculus Made Easy_ by Silvanus Thompson
was the best book to learn calculus from and when I found a used copy
I was very impressed. Its only problems as a textbook is that it does
make things simple rather than hard, and it is informal rather than
formal. Also, its examples and cultural references are very British
and rather out of date having been written in 1910 (it's also out of
print).

Luckily there's a new edition updated by Martin Gardner (St. Martin's
Press; Revised edition, September 1998; Hardcover 336 pages; List
price $21.95 ISBN 0312185480). I haven't bought the new version, but
the reviews at Amazon are excellent. See
http://www.amazon.com/gp/product/0312185480

But is it really a textbook? Sure, it has exercises. So what if it
only costs $21.95, I'm sure the college bookstore can raise the price.

Carl Schwent



--- In slideruleforum@yahoogroups.com, "Dale Price" <price.family@...>
wrote:
>
> I have just been named lead teacher on my districts committee to
> select new Calc and Pre Calc textbooks and to rewrite our old
> curriculum to match the Ohio math standards.
> I have to contact publishers asking for examination copies of books.
> Do you have any suggestions?
> Please tell me title, lead author, and publisher.
> You can send the ideas directly to me if you wish:
> dprice@...
> Thanks
> Dale Price
>