To: atm{at}shore.net
From: Jim Burrows 
Reply-To: Jim Burrows 


At 10:38 2003-05-14 -0700, Herb Kasler wrote:

>What  I am pretty darn sure about is that you don't need to measure lateral
>offsets when you do a regular wire test. In Sixtests, there is no place to
>enter Y offset data if you select "wire test". In fact, there is no
>difference in the output from what you get if you enter the same numbers
>under "Foucault test".

Yup, the only difference in Sixtests between "Foucault" and
"Wire" is the error estimates.  The more recent Lateral Wire Test
("LWT"), which is similar to the caustic test, and processed the
same way, does involve lateral distance readings combined with longitudinal
settings.  The difference between the LWT and the caustic (Gaviola) test is
the LWT longitudinal setting is usually the same for all zones (it doesn't
have to be constant, though), while the caustic longitudinal setting is
different for each zone, calculated from the RoC for that zone of a
parabolic surface close to the actual surface.

         -- Jim Burrows
         -- mailto://burrjaw{at}earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84)

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