The Catenary Curve I looked up in my K+E Decilon book and found the following information. The curve involves a chord of uniform weight per unit of length...
2643
Andrew Davie
adavie@...
Feb 1, 2000 1:49 pm
Hi everyone It's been a while since my last report, so thought I'd drop a note to the list to let everyone know how it's going. In short, slowly. Actually,...
2644
nhcotter@...
Feb 1, 2000 2:34 pm
Just to drive you closer to the edge, consider the P & Q scales. (The P of P&Q is not the sqrt(1-.1x^2) P scale popular in Europe. Both scales are identical,...
2645
Friedrich Diestelkamp
diestelsr@...
Feb 1, 2000 2:41 pm
Hello Chris "Golden Age" ever was and will be in the past. Why? With distance you only can see the shiny gold, not the dirt. In this list I only do observe as...
2646
Larry Stewart
larrys@...
Feb 1, 2000 9:45 pm
Greetings all! Friedrich, I too have had the lovely task of removing ball-point pen ink from a Slide Rule. Here are the methods that I have had the greatest...
2647
Mike Markowski
mm@...
Feb 1, 2000 9:46 pm
Andrew, ... In that case, you know the old saying: divide and conquer! Instead of one all-encompassing routine, recurse and occasionally send off recursive...
2648
John Mosand
jomosand@...
Feb 1, 2000 9:46 pm
... Ray Kornele Tractrix? Yes, I'm familiar with it. I think it was Leibniz(?) who used the following defining illustration: -The curve described by a dog...
2649
Solberg
solberg2@...
Feb 1, 2000 9:46 pm
My view is that the "Golden Age" of using slide rules was about 1900 to about 1970 and the "Golden Age" of collecting/studying slide rules is from about 1995...
2650
Mutsuura Associates, ...
mutsuura@...
Feb 1, 2000 9:47 pm
Does anyone have a copy of the instruction set for the PICKETT N4 rule? It doesn't have to be particularly for the N4 perse, although a copy of the original...
2651
Larry Stewart
larrys@...
Feb 1, 2000 9:47 pm
Hi again everyone! Friedrich, I forgot to mention a great way to clean the surfaces of Slide Rules (such as those made by Hemmi). According to the care ...
2652
Gary Lazarus
Gary_Lazarus@...
Feb 1, 2000 9:47 pm
Noel hi, I have a Hemmi 153 which has Ge, Theta, Re, P, Q, ans Q' scales on it. I've used them once for vector manipulation. I also have a manual that covers...
2653
Robert Hankins
easyx@...
Feb 1, 2000 11:16 pm
I do have an original instruction manual for the hyperbolic functions for the Pickett No.4 rule. This is a separate booklet that accompanied the rule in...
2654
SavageTom@...
Feb 2, 2000 4:07 am
I'm not a programmer. That said, I think the problem may be a little bigger. If you can answer the question "How frequent am I going to label the tick marks?"...
2655
Membership, Computer ...
raykornele@...
Feb 2, 2000 4:07 am
... A more modern and passive definition is that a tractrix is the curve followed by a guided projectile as it tracks a target moving in a straight line- e....
2656
walter shawlee
walter2@...
Feb 2, 2000 4:07 am
I had a lot of email requests for a simple mannheim manual on line, so we digitized the very early POST 1441/1444K pocket rule manual (which applies to...
2657
Gary Lazarus
Gary_Lazarus@...
Feb 2, 2000 4:07 am
Noel and Anna hi, I've just scanned the interesting bit of the manual for you. It's online at http://www.ckpg.com.au/sr/hemmi_153.pdf (390k). Regards, Gary ......
2658
Sam Greenlaw
samg@...
Feb 2, 2000 4:07 am
Sure. Photocopy is doable. The K&E green book is the best, though. Sam "mutsuura associates, inc." <mutsuur-@...> wrote: original...
2659
Andrew Davie
adavie@...
Feb 2, 2000 12:56 pm
Regarding recursive rendering of scales, Mike wrote... [snip/snip] ... Actually... NO. This is assuming that the scale we are drawing is more tightly packed ...
2660
gerwkr@...
Feb 2, 2000 12:56 pm
Hi Gary: Thanks for the Hemmi 153 pages. This is not as simple a rule as it looks. In addition to what your pages show it also gives the Gudermannian [gd(x)]...
2661
Raynor
raynor@...
Feb 2, 2000 12:57 pm
Regarding the cleaning of sliderules, on my Faber Castell 2/83N otherwise in mint condition, the slider is somewhat 'sticky'. I've tried various suggestions -...
2662
Peter Schuster
peters@...
Feb 2, 2000 12:57 pm
Dear sliderulers, I also use oil to clean my rules, but I NEVER would use vegetable oil (if it is what I think it is). It love it for cooking, but it tends to...
2663
Ronald Manley
r_e_manley@...
Feb 2, 2000 12:58 pm
Hello all I have now completed my analysis of Ebay slide rules prices for January 2000. I have also started analysing the trend in prices over time (which...
2664
Andrew Davie
adavie@...
Feb 2, 2000 12:58 pm
Alan Morris (author of the Accuracy vs. Precision article) has sent me a picture of the beautiful rotating Pickett Display Stand. I'm envious :) If you want a...
2665
Gary Lazarus
Gary_Lazarus@...
Feb 2, 2000 12:59 pm
I read in somebodies earlier posting that people seldom found a use for the LL scale. Well, this concerned me as the LL scale/s are probably the most exciting ...
2666
Wei, Michael
Michael.Wei@...
Feb 2, 2000 1:55 pm
... The oil/chips example was certainly interesting. Here are a few more mundane uses for the LL scales. 1. When the fast talking finanical adviser tells you...
2667
John Mosand
jomosand@...
Feb 2, 2000 2:32 pm
... Ray Sure, and that's why a tractrix is also called a 'pursuit curve'. Tractrix theory presumes that a point on the curve will never hit a point on 'the...
2668
Friedrich Diestelkamp
diestelsr@...
Feb 3, 2000 2:59 am
Hi Ron That is a nice liste! Thanks. Is that list of ebay.com only or other countries too (e.g. ebay.de for Germany, I saw some SRs in it!) Friedrich ...
2669
John Ahlstrom
jahlstrom@...
Feb 3, 2000 3:00 am
I believe there was a fuller sold on Jan 31. 245397055 $890 JKA -- You know you live in Silicon Valley when you think "I'm going to Fry's" is an acceptable...
2670
Peter Cornish
peter@...
Feb 3, 2000 3:00 am
You can get a silicon spray that should not harm the surface - most woodworkers use it to prevent wear on the beds of their machines. It really does lubricate!...
2671
Nick and Kay Sheldon
nick.sheldon@...
Feb 3, 2000 3:01 am
Hi Tractrices are also used to describe the curvature used in many horn-loaded loudspeakers, such as those of Dr.Edgar's. Any audiophile SR-fans may be ...
