[pure-silver] Re: Slide rules
- From: "tOM Trottier" <tom@xxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 19 Jul 2017 04:10:03 -0400
On Tue, Jul 18, 2017 at 5:59 AM, Martin magid
<martin.magid@xxxxxxxxx> wrote: I keep a slide rule in my shop
room (sometimes a darkroom to develop B&W) to determine the size
of pinholes, using Captain Abney's formula, which involves the
square root of focal length. I seem to have lost the ability
to do square roots manually.
I had a semester-long class on the slide rule in engine
school, and the most important thing I learned was the basis of
its construction. While working as a consulting engineer a few
years later, I developed a special application slide rule to
easily determine the answer to a problem of scheduling that
occurred many times a day in a client's business.
Be fruitful and multiply. Or divide.....
tOM
--
"Work to eat, eat to live, live to bike, bike to work." -- Naomi Bloom
“If at first the idea is not absurd, then there is no hope for it.” —
Albert Einstein
_~o "It is by riding a bicycle that you learn the
_-\<,_ contours of a country best,
(_)/ (_) since you have to sweat up the hills
and coast down them. " ~ Ernest Hemingway
“Don’t buy upgrades, ride up grades.”—Eddy Merckx.
tOM Trottier +1 613 860-6633 tOM@xxxxxxxxxxxxx Skype:Abacurial
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