Ben Kovitz asked: Does anyone know some of the most common, typical calculations that engineers performed on slide rules back in their heyday? Was it really...
42752
opticaldesigner
May 6, 2012 7:02 am
Dear Bill I couldn't see the attachment, however I checked your spreadsheet from www.hyperbolicsliderules.com: assuming that this is the latest version of this...
42753
opticaldesigner
May 6, 2012 7:02 am
Dear Hemmi enthusiasts I am in the thick of a dating exercise and I'm new to the slide rule dating game, so it seems to me I need a dating 101 kit, comprising...
42754
Paul Anderson
wackyvorlon@...
May 6, 2012 1:15 pm
Just saw one of these on eBay: http://www.moonstick.com/moonstick.htm Anyone here heard of this company before? Sent from my iPad...
42755
Cyril Catt
newcastleewc...
May 6, 2012 1:49 pm
There was a surge of interest in the Moonstick about a decade ago. Its an interesting device, using a set of six triangular sectioned rods with different edge...
42756
Cyril Catt
newcastleewc...
May 6, 2012 2:00 pm
I've just noted that the Moonstick website Order Dept is closed until further notice. The company's order form included: moonstick -- $65.00 each (shipping...
42757
Dave KK7SS
d3j452
May 6, 2012 2:07 pm
I first started work as a laboratory assistant at what was to eventually become Mallory Batteries. One of my functions was to perform micro-analytical analysis...
42758
Cyril Catt
newcastleewc...
May 6, 2012 2:27 pm
Ben Kovitz wrote: Do you find that as you are reaching for a slide rule to do a calculation, you visualize where the answer will be? Only for the basic A, B,...
42759
edeanbutler
May 7, 2012 1:36 am
Sounds like a Fuller cylindrical slide rule???? E. Dean Butler Broughton Green, UK From: sliderule@yahoogroups.com [mailto:sliderule@yahoogroups.com] On Behalf...
42760
charles lehman
clehman67
May 7, 2012 1:37 am
I believe it's possible he may have actually been able to see the SR in his mind's eye. Some children in Japan have been taught how to perform multiple...
42761
edeanbutler
May 7, 2012 1:37 am
Eight or ten months ago there was a surge of Moonsticks available on eBay. From what Cyril says below re. pricing, I was the lucky guy who paid the lowest...
42762
Hans E. Hansen
dino_and_sta...
May 7, 2012 1:38 am
I had a sales manager that could estimate surprisingly difficult multiplication and division problems in his head. Like, say, 2843 * 453. With only a couple...
42763
Paul Anderson
wackyvorlon@...
May 7, 2012 1:38 am
In playing with my recently acquired KL-1, I've noticed that if the movable scale indexed is aligned with the fixed hairline, moving a value from the outer...
42764
Paul Anderson
wackyvorlon@...
May 7, 2012 1:38 am
I was thinking of a Thacher. Sent from my iPad...
42765
Maynard Wright
mngwright
May 7, 2012 3:48 am
I agree with Cyril's comments. I used a slide rule for some repetitive tasks such as multiplying 12 frequency-selective measurements by four different...
42766
Steve Treadwell
dfsmth45
May 7, 2012 6:01 am
Hi Paul, There is an English version of the instructions at the International Slide Rule Museum (look under Pocket Watch Calculators), but they don't really...
42767
Lennart Börjeson
lenborje
May 7, 2012 6:58 am
Some years ago I bought a moonstick frpm them. While not exactly a slide rule, it's an ingenious device and an entertaining conversation piece. !++ ! Lennart...
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Paul Anderson
wackyvorlon@...
May 7, 2012 4:40 pm
Thanks! That's extremely helpful. Another thing I've been working on is getting the cosine. The method I've come up with seems to work fairly well: Find...
42769
tdewey100
May 7, 2012 11:22 pm
There's a quote from the Stephen Cohen that he could "picture the 600ES" in his head and use it to do approximate calculations. ...
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John Schudy
taagaarai
May 7, 2012 11:22 pm
There's a much easier way to find the cosine, but it's not very geeky or slide-ruley: cos x = sin (90 - x) = sin (pi/2 -x) That is, find the complement of the...
42771
Steve Treadwell
dfsmth45
May 7, 2012 11:23 pm
Or use the fact that cos(theta) = sin(90-theta). So subtract your angle from 90 and set the pointer to that angle and find the sine. For example, cos(60º) =...
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John Schudy
taagaarai
May 8, 2012 3:10 am
I thought I said that. :-) John ... [Non-text portions of this message have been removed]...
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Steve Treadwell
dfsmth45
May 8, 2012 5:21 am
Yeah, you did, but I had not seen your post when I posted. Steve Treadwell...
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Paul Hirose
paulhirose
May 9, 2012 12:35 am
... Actually, that formula is extremely "slide-ruley". Look at the S scale on most rules. With a double set of numbers it gives both sines and cosines. My...
42775
jerry_mccarthy_uk
jerry_mccart...
May 9, 2012 1:15 pm
... Now that is a valuable tip; having found the gjm folder, I had wondered what I had been doing wrong. Regards, Jerry McCarthy, U.K....
42776
dieswartdose
May 9, 2012 5:44 pm
Or it could have been a one-off modelled on the Otis King, with a longer scale and a wooden cursor instead of a metal one. Peter Johnson...
42777
wshawlee2
May 9, 2012 6:23 pm
For those of you looking for some really high end boxed K+E rules, we just got in a few truly amazing items, all new in the box. The most astonishing set is a...
42778
Paul Hirose
paulhirose
May 9, 2012 9:03 pm
Recent news stories about obesity in America got me thinking about how a slide rule might be used to calculate BMI (body mass index). It's a function of a...
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Mark Armbrust
cadet1620
May 9, 2012 11:07 pm
... m / (h^2 / 700) My BMI was coming out a bit low in English units... 8-) --Mark Armbrust...
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Paul Anderson
wackyvorlon@...
May 9, 2012 11:07 pm
I was thinking you could use the gauge mark a lot of rules have at 785. That might be too far off, though. Sent from my iPad...
