Spike Brewing 12.5 Conical Fermenter Giveaway - Enter Now!

Home Brew Forums > Home Brewing Community > General Chit Chat > Reverse Polish Notation - HP 48G

Reply
 
LinkBack Thread Tools
Old 09-10-2012, 10:02 PM   #1
lschiavo
Drinks Beer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
lschiavo's Avatar
Recipes 
 
Join Date: Sep 2009
Location: Surrounded by Yoopers
Posts: 3,940
Liked 768 Times on 510 Posts
Likes Given: 523

Default Reverse Polish Notation - HP 48G

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

GEEK PORN:

__________________
lschiavo is offline
 
Reply With Quote Quick reply to this message
Old 09-10-2012, 10:09 PM   #2
DeafSmith
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
DeafSmith's Avatar
Recipes 
 
Join Date: Jan 2009
Location: Richardson, TX
Posts: 1,447
Liked 33 Times on 31 Posts
Likes Given: 9

Default

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!

__________________
DeafSmith is offline
lschiavo Likes This 
Reply With Quote Quick reply to this message
Old 09-10-2012, 10:25 PM   #3
lschiavo
Drinks Beer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
lschiavo's Avatar
Recipes 
 
Join Date: Sep 2009
Location: Surrounded by Yoopers
Posts: 3,940
Liked 768 Times on 510 Posts
Likes Given: 523

Default

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.
__________________
lschiavo is offline
 
Reply With Quote Quick reply to this message
Old 09-10-2012, 10:49 PM   #4
DeafSmith
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
DeafSmith's Avatar
Recipes 
 
Join Date: Jan 2009
Location: Richardson, TX
Posts: 1,447
Liked 33 Times on 31 Posts
Likes Given: 9

Default

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.
__________________
DeafSmith is offline
 
Reply With Quote Quick reply to this message
Old 09-10-2012, 11:02 PM   #5
DeafSmith
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
DeafSmith's Avatar
Recipes 
 
Join Date: Jan 2009
Location: Richardson, TX
Posts: 1,447
Liked 33 Times on 31 Posts
Likes Given: 9

Default

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.

__________________
DeafSmith is offline
 
Reply With Quote Quick reply to this message
Old 09-10-2012, 11:09 PM   #6
passedpawn
Waste Allocation Load Lifter - Earth Class
HBT_MODERATOR.png
Feedback Score: 0 reviews
 
passedpawn's Avatar
Recipes 
 
Join Date: Apr 2009
Location: ☼ Clearwater, FL ☼
Posts: 18,589
Liked 3184 Times on 1990 Posts
Likes Given: 2712

Default

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.

__________________
What Would Vermeer Paint?
passedpawn is offline
 
Reply With Quote Quick reply to this message
Old 09-10-2012, 11:22 PM   #7
lschiavo
Drinks Beer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
lschiavo's Avatar
Recipes 
 
Join Date: Sep 2009
Location: Surrounded by Yoopers
Posts: 3,940
Liked 768 Times on 510 Posts
Likes Given: 523

Default

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

__________________
lschiavo is offline
 
Reply With Quote Quick reply to this message
Old 09-10-2012, 11:36 PM   #8
david_42
Feedback Score: 0 reviews
 
david_42's Avatar
Recipes 
 
Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,651
Liked 133 Times on 126 Posts

Default

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.

__________________

Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk

david_42 is offline
 
Reply With Quote Quick reply to this message
Old 09-10-2012, 11:39 PM   #9
b-boy
16%er
HBT_LIFETIMESUPPORTER.png
Feedback Score: 5 reviews
 
b-boy's Avatar
Recipes 
 
Join Date: Jun 2011
Location: GETZVILLE, NY
Posts: 2,348
Liked 402 Times on 296 Posts
Likes Given: 118

Default

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?

__________________

Never underestimate the potential of someone who refuses to act their age.

b-boy is offline
 
Reply With Quote Quick reply to this message
Old 09-10-2012, 11:45 PM   #10
lschiavo
Drinks Beer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
lschiavo's Avatar
Recipes 
 
Join Date: Sep 2009
Location: Surrounded by Yoopers
Posts: 3,940
Liked 768 Times on 510 Posts
Likes Given: 523

Default

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?
__________________
lschiavo is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
US goes to war with Poland-Destroyer USS Ramage fires upon Polish port (accident) Beer_Maker General Chit Chat 20 01-11-2010 07:11 PM
Any Polish-Speakers or Genealogical Wizards Around? KingBrianI General Chit Chat 3 07-08-2009 02:00 AM
Reverse Mortgages cheezydemon General Chit Chat 72 05-07-2008 04:06 AM