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Old 08-14-2016, 05:35 PM   #121
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FYI, slide rules are valuable antiques these days. Do not throw them out.

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Old 08-14-2016, 05:56 PM   #122
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You don't need slide rules for math, you need them for science. Long strings of calculations used in electronics and chemistry and physics.

The concept is multiplication can be done by the addition of logarithms.
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Old 08-14-2016, 08:39 PM   #123
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FYI, slide rules are valuable antiques these days. Do not throw them out.

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That had never occured to me. I have a nice K&E slide rule from college days. I think I bought it in 1966 and at the time thought it was outrageously expensive at, if I remember correctly, $20.
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Old 08-15-2016, 10:07 AM   #124
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FYI, slide rules are valuable antiques these days. Do not throw them out.
Interesting. There were so many of them, and they take so little space, that I'd think they'd be commonplace even now. I inherited what I think is a nice one that was my father's. It's in a nice leather case and is about three feet long. I haven't the foggiest idea of how to use it.
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Old 08-15-2016, 10:13 AM   #125
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Interesting. There were so many of them, and they take so little space, that I'd think they'd be commonplace even now. I inherited what I think is a nice one that was my father's. It's in a nice leather case and is about three feet long. I haven't the foggiest idea of how to use it.
Here is a nice link from hp that explains slide rule use. Basic Slide Rule Instructions
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Old 08-15-2016, 10:18 AM   #126
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Here is a nice link from hp that explains slide rule use. Basic Slide Rule Instructions
Thanks. I bookmarked it and will study later when at home and can practice. Higher math stuff is not my strong point and on the list of "World's Greatest Inventions" I think electronic calculators are right up there near canned beer.
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Old 08-15-2016, 11:00 AM   #127
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I remember studying logarithms and doing exercises with logarithm tables when I was in ninth grade. Good thing that when I went to engineering school they allowed calculators. They made a big deal of it - ours was the first freshman class allowed to use them.
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Old 08-15-2016, 12:20 PM   #128
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I think this form of slide rule is still in use! I'm sure there are more than a few people here that have one.
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Old 08-15-2016, 06:11 PM   #129
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I used a circular slide rule during my days as a submariner. We wore them around our necks with a shoestring through the center hole. Back then, the fire control system was very primitive and we did a lot of manual calculations to track targets and shoot torpedoes.
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Cursive Writing?
Old 08-15-2016, 06:57 PM   #130
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Cursive Writing?

People will regret giving up old time "technology". I was the last one at work who could read the cursive writing in old deeds, and use any type of survey equipment that didn't require batteries. I'm afraid that future generations won't understand the fundamentals behind the new technologies. I've never seen the round slide rule. My straight one is on display with the other old instruments at my former workplace. I need to get it back.


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Old 08-15-2016, 07:08 PM   #131
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Round ones are cool because they are smaller, but you pay the price with the "inner scales"
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Old 08-19-2016, 09:59 PM   #132
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Interesting. There were so many of them, and they take so little space, that I'd think they'd be commonplace even now. I inherited what I think is a nice one that was my father's. It's in a nice leather case and is about three feet long. I haven't the foggiest idea of how to use it.
I will give you $5 for it.

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Old 08-20-2016, 01:05 PM   #133
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I will give you $5 for it.
No thanks. I'm waiting for it to become a priceless heirloom.
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Old 08-20-2016, 02:59 PM   #134
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To me the value of circular slide rules is never having to run off the scale. You don't have that error to deal with.
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Old 08-20-2016, 04:45 PM   #135
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I was the last one at work who could read the cursive writing in old deeds
Still, that sort of thing can be learned.
When I started doing some genealogical research, I ran up against old German script that was completely unreadable to me. But I found a website with a tutorial for deciphering this sort of script. It's still hard work to figure it out, but at least it's possible.
For example:
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File Type: png Screen Shot 2016-08-20 at 6.38.47 PM.png (129.7 KB, 11 views)
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Old 08-20-2016, 06:48 PM   #136
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Ok, I'll bite! What's it say
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Old 08-20-2016, 07:19 PM   #137
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Ok, I'll bite! What's it say
"If you can read this, you're too close"?
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Old 08-20-2016, 08:31 PM   #138
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Thanks. I bookmarked it and will study later when at home and can practice. Higher math stuff is not my strong point ...
OK Walt, here is an easy one.

you plus 2 of your bodies go to the early bird special. The Entree Combo is 13.95, and includes your drink. Sales tax is 6.5%. You wish to leave an 18% tip. How much do you leave on the table?
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Old 08-21-2016, 05:31 AM   #139
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Ok, I'll bite! What's it say
I like Nemo2's answer better, but I won't spoil your fun:
Script Tutorial: making sense of old handwriting
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Old 08-21-2016, 12:17 PM   #140
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OK Walt, here is an easy one.

you plus 2 of your bodies go to the early bird special. The Entree Combo is 13.95, and includes your drink. Sales tax is 6.5%. You wish to leave an 18% tip. How much do you leave on the table?
Well, since I'm only paying for my own meal, and not tipping on the sales tax, the 18% tip would be 2.5, rounded down from 2.511. Confession: I did it with a calculator. Looking at the slide rule I got cross-eyed.
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