[sdiy] The Dreaded ROHS

[David Ingebretsen]

There is a very interesting book called "A Mathematician Reads the
Newspaper" which expounds on this type of analysis exactly. Very good read.
Eye opening as to how to actually "think" about the all too often tainted,
subjective, and biased arguments used to misrepresent reality.

David

David M. Ingebretsen M.S., M.E.
Collision Forensics & Engineering, Inc.
2469 East Fort Union Blvd. STE 114
Salt Lake City, UT 84121
www.CFandE.com

801 733-5458 Office
801 842-5451 Cell

dingebre at CFandE.com
dingebre at 3dphysics.net



-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Bob Weigel
Sent: Monday, February 16, 2009 12:33 AM
To: Seb Francis
Cc: Synth DIY
Subject: Re: [sdiy] The Dreaded ROHS

DOH!  hehe.  Well if you *think* about it it's really not all that 
difficult.  Doing 'worst case scenario' calculations is a very useful 
technique in making a point on some kinds of issues. 

For example I recently calculated that if 1 billion people of the world 
drove some log truck that intakes .5 cf per rev (350 does .1 cf per rev) 
of let's say..utterly polluted useless air (which isn't the 
case..but..just say to get a concept) out the other side... and they all 
drove them 10,000 miles per year... the total impact on the atmosphere 
would be on the order of  1.7ppm were it just to accumulate and nature 
to do no cleansing whatsoever.  So that gives people a scale by which to 
judge hypothesis like that certain things will dither up and ruin the 
ozone layer etc.  Doing these kinds of calculations broaden one's 
perception of what is and isn't feasible. And give one a broader scope 
of understanding of the universe we live in.  and..keep us from being 
duped by scumbags so that we have hopefully more time to do fun and 
useful things :-)    So many potential scams..so little time.. -Bob

Seb Francis wrote:

> Bob Weigel wrote:
>
>>
>> I did the calculations on a way worst case scenario.
>
>
> One has to marvel at Bob's calculating abilities ;)
>
> .... and did he take into account if a screwdriver in the landfill 
> accidentally shorts out a non-ROHS capacitor?
>
> Seb
>
>
>
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