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45122
Re: base-2 mega & giga Gentlemen, Approximations of this variety seem to have stopped being taught about the time I hit High School. Every time I see "The list can go on" I salivate.
William Brohinsky
6:32 PM
#45122
 
45121
Re: base-2 mega & giga I would love to see some of the trig approximations. (As many as you can find?) These are the little extras which made sliderules much more useful than most
Charles Quinlan
6:31 PM
#45121
 
45120
Sighting - Cosmos This week's episode covers the life of Clair Patterson, investigating lead contamination in the environment as a byproduct of his research into determining the
mjbauer001
6:29 PM
#45120
 
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45119
Re: Spirule The Spirule is a fun toy, .... errr... tool. I have mine from my control systems course at Virginia Tech and got another from eBay that I plan to pass on to
Ron McConnell
6:28 PM
#45119
 
45118
Spirule I have an original Spirule with original instructions and a copy of Walt Evan's book "Control System Dynamics" which has an Appendix devoted to the use of his
garco325@att.net
Apr 21
#45118
 
45117
Re: base-2 mega & giga this approximation is a particular case of : general approximation (1+x)^n = 1+nx if x is fairly small compare to 1. in your case (1+(-x))^(-1) = 1 +
Fabrice 94
Apr 21
#45117
 
45116
Re: base-2 mega & giga Back before computers and hand held calculators, the use of approximations or the teaching of such was very common. I recall in my undergraduate days learning
sliderulenut
Apr 20
#45116
 
45114
Re: base-2 mega & giga Thanks!!!! I had not thought about using this "approximation" rule, but it sure hit the spot for some calculations I was doing... and, just in time. Q ... On
Charles Quinlan
Apr 19
#45114
 
45113
base-2 mega & giga Applying Moore's Law on a slide rule recently, I needed a value for 2^20, the base-2 "mega". Of course in many cases one million is close enough, but I wanted
Paul Hirose
Apr 18
#45113
 
45112
Re: ST introducrtion Thanks, Clark, sorry for the delay. I didn't mean to imply that Rietz was the first to use the CI scale. I only meant that he added the CI to his scale
sliderulenut
Apr 18
#45112
 
45111
Re: ST introducrtion Thanks, Steve, I came to that conclusion a few hours ago. I used m which is the common nomographic term for modulus or length of the scale being used. marion
sliderulenut
Apr 17
#45111
 
45110
Re: ST introducrtion Hi Marion, This equation would be to calculate the distance from the left index, where L is the total scale length. Using 1.8 keeps the argument of the log
Steve Treadwell
Apr 17
#45110
 
45109
Re: ST introducrtion Chris Redding some time ago used the expression d = L*log[x*pi/1.8]. Where does this come from? It seem strange to use 1.8 instead of 180 which is the proper
sliderulenut
Apr 17
#45109
 
45108
Re: ST introducrtion It would probably be best to use the radian as the basis for the ST or SRT scale as the tangent converges toward x from greater than x as x becomes much less
Maynard Wright
Apr 16
#45108
 
45107
Re: ST introducrtion Thanks! Q ... On Wed, 4/16/14, Steve Treadwell wrote: Subject: Re: SR ST introducrtion To: sliderule@yahoogroups.com Date: Wednesday,
Charles Quinlan
Apr 16
#45107
 
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45106
Re: ST introducrtion Which would make sense as the trig scales are based on the "unit circle" and the measure of the arc would be more accurate at that small an angle. Q ... On
Charles Quinlan
Apr 16
#45106
 
45105
Re: ST introducrtion It seems that different manufacturers used different values - some used the radian, some the sine, and some an intermediate value. Go to the group web site
Steve Treadwell
Apr 16
#45105
 
45104
Re: ST introducrtion And FR wrote definitely arc0.01x for ST scale, and there are two small marks by 6° left for sine and right for tangent. Zoltán On Wednesday, April 16, 2014
Zoltán
Apr 15
#45104
 
45103
Re: ST introducrtion That is why K&E called it the SRT scale after 1955 on their decimal-trig rules after 1955. Clark From: sliderule@yahoogroups.com
Clark
Apr 15
#45103
 
45102
Re: ST introducrtion I haven’t got any written proof but as far as I know the ST scale is neither sine nor tangent, it’s the length of the arc: sin5.5°=0.09585 ≈
Zoltán
Apr 15
#45102
 
45101
Re: ST introducrtion Hi Marion I had not thought about the origin of the ST scale. K&E did not use it until the introduction of the 4080-3 and 4081-3 in 1936. K&E first put a CI
Clark
Apr 15
#45101
 
45100
ST introducrtion Does anyone know what scale factor was used on the original introduction of the ST scale? I understand Dr. Rietz introduced the ST scale around 1925 or 1929 on
sliderulenut
Apr 15
#45100
 
45099
Re: Spare Parts and Trading Thanks all for your suggestions. This is a wonderful group. Tom Wetmore
Thomas Wetmore
Apr 11
#45099
 
45098
Re: Spare Parts and Trading Tom, If you just want to buy a cursor you can try here: http://srtco.us He has some K&E parts - a window for your 4083 lists for $16. I've bought parts and
Steve Treadwell
Apr 10
#45098
 
45097
Re: Spare Parts and Trading Hi Tom If you are just looking for the glass I have 6 to 8 pieces for that frame size. They are used but in good condition. Clark McCoy From:
Clark
Apr 10
#45097
 
45096
Re: Spare Parts and Trading Tom, I have recently seen on Ebay an advertisment for replacment cursor windows that I believe are for that size rule. I seem to remember an asking price
Not Here
Apr 10
#45096
 
45095
Re: Spare Parts and Trading There is/was a guy on eBay selling decent repro parts for K&E. I've bought some cursors, etc. and was very satisfied. Hans.
Hans E. Hansen
Apr 10
#45095
 
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45094
Spare Parts and Trading I'm a new member and a relatively new collector. I have about 30 rules, concentrating on K+E, but with representatives from other manufacturers. I have a
ttwetmore
Apr 10
#45094
 
45093
Re: Slide rule simulations Not exactly simulation software, but I have online virtual rules for Sun-Hemmi 153 K+E 4093-3 K+E Analon
Mark Armbrust
Apr 8
#45093
 
45092
Re: Slide rule simulations You can try the entire collection at: http://www.hercsmusicsystems.com/sliderule.html
Robert Wolf
Apr 8
#45092
 
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