Next message: Robert Eno: "Re: Error of Perpendicularity"
Robert,
You could also look on page VIII of the instructions and advice in my Tables
for Clearing. A little table inserted there shows errors resulting from 25
different combinations of misalignment and angle measured. Unless I'm overlooking
something, the problem of an index mirror out of perpendicular with the plane
of the arc is the same as that of line of sight out of parallel. If so, the
table should agree with what you get with Alex's formula.
Bruce
