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Old 09-10-2012, 10:02 PM   #1
lschiavo
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If the title made any sense to you, you are a huge geek

I just dug mine up and it still works! I still love the unit conversions...might be handy on a brewday?

I searched and see you can still buy these for about 200 big-uns. Make me an offer

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Old 09-10-2012, 10:09 PM   #2
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I still have (and use) my HP42S. Love the RPN. But the one I really like to use is the one in my avatar - Ricoh 151 slide rule. That, and my 27 rod soroban (Japanese style abacus). Yeah, I'm old school!

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Old 09-10-2012, 10:25 PM   #3
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Quote:
Originally Posted by DeafSmith View Post
I still have (and use) my HP42S. Love the RPN. But the one I really like to use is the one in my avatar - Ricoh 151 slide rule. That, and my 27 rod soroban (Japanese style abacus). Yeah, I'm old school!
I never had the 42S but I have seen plenty of them. Why not still use it? It, like the GP is a tank. I actually should have two slide rules (dad's and grandpa's). I need to figure out the slide rule...I was never taught (I'm only 40). If I can find them, that is my next project.

 
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Old 09-10-2012, 10:49 PM   #4
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Quote:
Originally Posted by lschiavo View Post
I never had the 42S but I have seen plenty of them. Why not still use it? It, like the GP is a tank. I actually should have two slide rules (dad's and grandpa's). I need to figure out the slide rule...I was never taught (I'm only 40). If I can find them, that is my next project.
I used a slide rule in college (MEE in '69) and for the first few years on the job. I bought a HP-45 in '73; put my Post Versalog slide rule in a drawer and didn't look at it again until an article about slide rules was published in Scientific American in (IIRC) 2006. Got interested and started collecting them - bought a bunch on eBay (got to be careful there, though, because many are missing the cursor, or screws, or have the owner's name scratched into the rule). I've got somewhere over 100 slide rules now. If you get one, there are a lot of books and manuals available on line, and there are some on-line emulated slide rules that you can play with (search for virtual slide rules).

http://www.sliderulemuseum.com/ (click the "Slide Rule Library, Manuals & Books" button)

For books, I recommend "The Slide Rule" by Lee Johnson at the above site.

The Post Versalog manual is good, too, though oriented toward that particular slide rule.

And there is a yahoo group list - the International Slide Rule Group for discussions about slide rules. Also the Oughtred Society ($35/year) which puts out a nice journal (2 issues/year), mostly oriented toward collectors.

 
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Old 09-10-2012, 11:02 PM   #5
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I forgot to mention that I use my slide rule in brewing, too. It's really useful to calculate your post boil gravity and volume given the pre boil gravity and volume. For example, if I have 6.9 gallons at 1.042 preboil, I just set the cursor hairline to 4.2 on the D scale, move the slide to set 6.9 on the CI scale under the hairline, then I can just move the cursor to any desired volume on CI to find the post boil gravity, or conversely move the cursor to any desired post boil gravity on D and read the necessary boiled down volume on CI. I can see at a glance that 6.25 gallons = 1.0464, 6 gallons = 1.0483, 5.5 gallons = 1.0527, etc.

 
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Old 09-10-2012, 11:09 PM   #6
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I've got that HP48 and an HP28S sitting next to me right now. I use the 28 almost every day. RPN is the only kind of calculator I'm comfortable with. And, I must have an endless stack. I can't stand using a calculator that isn't RPN with an argument stack.

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Old 09-10-2012, 11:22 PM   #7
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That's good stuff there DeafSmith. I've got some study ahead.

What battery would you recommend for the slide rule? If I find the heirlooms, I'm sure I'll need new batteries

 
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Old 09-10-2012, 11:36 PM   #8
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Ha, ha! My wife used to do HP tech support and she has a box full of calculators. She still had to buy a new one for her accounting statistics course, because the textbook and instructor assumed you had a specific calculator.
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Old 09-10-2012, 11:39 PM   #9
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I just use my fingers and and sometimes my toes

Actually, in college (70s-80s) I had an HP that allowed you to store formulas and stuff on 1 inch long tapes that you slid into the unit. You could do simple programming with it too. A lot of people were using them to cheat on exams, so they got banned. I can't remember the model. Anyone ever use on of these?
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Old 09-10-2012, 11:45 PM   #10
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Quote:
Originally Posted by passedpawn View Post
I've got that HP48 and an HP28S sitting next to me right now. I use the 28 almost every day. RPN is the only kind of calculator I'm comfortable with. And, I must have an endless stack. I can't stand using a calculator that isn't RPN with an argument stack.

I have not seen that 28S but I like it. I bet the hinge is a weakness. There's gotta be some sort of ribbon cable in there. Well, you have the 48G to back you up

Now that I found it, My 48G is going on my desk. I've been using a radio shack solar for years. I usually only add and subtract in my line of work but who wouldn't miss a cube root at your fingertips?

 
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