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Sera iron test

At 03:48 PM 4/16/99 -0400, Paul Sears wrote:
>What you need is a _path_ length 2.5 times as long for the light
>passing through the liquid.  Using more water won't help unless you lengthen
>the light path.  

Which is why I recommend putting 25ml, not 5, in the cylindrical sample tube,
then observing down thru the top as the directions imply.

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com