7 Jul
2012
7 Jul
'12
12:13 p.m.
On Fri, 6 Jul 2012, Tony Duell wrote:
Yes, that; the exact conversion (as you well know), which is what I sue
when I am doing colour processing, or settign up a thermocouple
thermometer, or...
The point is 'double it and add 30' is easy to do in your head. And it
_is_ good enough for weather temperatures (which are hardly exact in the
first place).
Not a rhyme, but something I still use to covnert
temperatures from
celsius to 'the understandable scale' (as one weatherman put it) is
'double it and add 30'. No, I don't use that whn calibrating a
thermocouple, or for colour photographic procesisng, or.. but for the sort
of temperatures used i neather forcasts it's accurate enough and is
trivial to do in your head.
Damn!
All this time, I've been multiplying by 1.8 and adding 32; no wonder I've
been getting it wrong!
In elementary school (5th grade), the teacher the book said, PI is about
3.14 or 22/7.
Err, 355/113 :-)
The teacher insisted that that meant that it was about 3.14, and exactly
22/7.
I got into a LOT of trouble for arguing.
'And for that number
We motals know as pi
He proved threan-and-one-seventh
Wsa a little bit too high'
From the Archimedeans (Cambridge University maths
society) song.
Heover , any teacher who doesn't realise that pi is irrational, or
doesnt'; know what irrational means, shoudln't be in the job.
-tony