Dave Plowman wrote:

'Zone valves, etc' require a basic understanding of electricity to
install. Guess why our resident 'expert' doesn't like them...

It is interesting to watch in a way, but he seems to live in a world
totally governed by "rules of thumb". If he does not have one to hand
for the topic, then he will just grab one from the nearest web page, and
then cling to it for all he is worth, even when clearly it's way beyond
reason. I suppose it might be a result of a complete lack of analytical
/ scientific reason, or perhaps even a lack of basic mathematical
ability. Hence a rule of thumb is a simple way to overcome some of these
limitations that does not require taxing thought, vis:

Not able work out the actual pipe sizes required for your gas feed based
on flow resistances and pressure drops? apply rule "Install 22mm direct
to meter"

Don`t understand heat loss calcs? apply rule "you need 400mm of
insulation and tin foil under your tiles".

and so on...

Even uses if for politics: Difficulty applying observational reason or
historical precedent to political situations? apply rule of thumb "All
political ills can be solved by sticking with Tone"

Had you latest bright idea torn to shreds on usenet? apply rule "Snip
rational argument from post, and replace with insult or non sequitur,
hope no one notices!"


--
Cheers,

John.

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