Re: [ATM] Luri-Houghton prescriptions.

["Bob May" <bobmay@nethere.com>]

The TRACE program assumes that the scope is pointing up and that
down is negative for distance as well as curvature so a typical
refractor will have the following order of signs, -,+,+,?.  The
distances are absolute also.  As a result, the first curve is
negative and the distances all tend to be negative.
Bob May
bobmay at nethere.com
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Thank you for your understanding!

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