Weird double post. Sorry about that.
My HP12c original batteries lasted over 12 years. The second set is still running strong. Can not tell you how many times I have lost it which would cause minor depression only to find it sometimes months later.
Great calculators! I had one of the first HP35s when it came out in , what, '73? Then I got the HP45 when it came out, and the HP25. I was a working field engineer in the telecom field then and they were all very useful.
I bought an HP15c and HP12 financial calculator back in MBA school in '83 or '84. Still have them and still use them to this day. They are both right here at the side of my desk and I use them almost every day. I think I have only changed the batteries 4 or 5 times over the almost 28 years.
Edited to add: I also still have my old Post Versalog II laminated bamboo slide rule from engineering school back in the 60's! I have to admit I don't use it very much, but it is fun to pull out once in awhile and watch the young engineers eyes bug out!
Here's another legend:
He taught to always estimate before you calculate. You can catch a lot of errors this way.
He taught us about significant figures.
And he taught us to do "unit math" which is so important when dealing with numbers that represent physical things where you have units of measure.
He did not allow calculators. You either did all your math... and there was alot... by hand or you let him teach you to use a slide rule. His goal here was to expose you to the slide rule but, even more so, the underlying methods that the slide rule teaches.
I learned a lot of chemistry too.
He was one of the greatest... won the Dow Chemical Catalyst Award as best high school chemistry teacher of... as I recall... maybe... 1978.
Last edited by Gollnick; 01-07-2012 at 06:08 PM.
I have this one. Probably my all-time favorite.
I remember borrowing my dad's HP once for an exam in the 1980s. The "missing key" sure made me nervous.:
The first calculator I used was an HP-80. My friend's dad worked for HP and had one that we learned how to use. When I tried using a standard calculator, I didn't know what to do with the extra key...
Although i have gotten better using standard algebraic notation over the years, I am still faster using RPN.
Everyone is.Although i have gotten better using standard algebraic notation over the years, I am still faster using RPN.
If I have to use an algebraic calculator, even just to add two numbers, I have to stop and concentrate really closely on just keying the math into the calculator. I think any extended session would give me a splitting headache. RPN is just so much more natural... of course, you have to actually understand what you're doing; you can't just blindly key in the equation and press that silly key.
HP used to have a t shirt that had:
ENTER > =
If I am doing calculations on an HP and I press a wrong key, 99% of the time I can easily recover without having to start the whole calculation over again. With an algebraic calculator, I usually have to start back at square one.
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