Re: ATM "Foucault Data Reduction" ver 2.3 AKA: tex23.zip

["Tom Polk" <jojo@net-master.net>]

Hello Mark,

The way Texereau words it, I interpret it as the actual screen itself had
to be measured this accurately. "The finished screen may not conform
precisely to the values which were planned; therefore after cutting we
determine the actual inside and outside zone dimensions to the nearest
half-hundredth or 0.005 inch. We must average the radii for left- and
right-hand apertures. This we can do conveniently by measuring the inside
and outside zone diameters. For each zone then we derive the radius h(m) by
adding inside and outside diameter and dividing by 4, then calculate the
ideal longitudinal aberration h(m)2/R with which we shall later compare the
values found experimentally." Hope I did not violate only copyright laws
here! How (if you use this method) do you go about it and figure "h(m)"?
What material do you use as a screen.

Tom Polk
jojo@net-master.net
Hartselle,   AL

----------
> 
> Re the second question, you don't...just measure it when you're done and
> average the readings.  It's just one of the residual uncertainties in
> the test that encourage you to lop all but the first two digits or so
> when you finish the calculations, which is about all you can count on
> anyway.  :)
> 
> Best,
> 
> 
> Mark Cowan
> Salem, OR