The recent thread?ÿon prism pointing and the paper linked there by @john-hamilton got me to looking for other takes on the subject.?ÿ There is a lot on 360 prisms.?ÿ Less on old-fashioned ones.
This paper looks at the effect of orientation of various prisms.?ÿ I didn't pay much attention to the 360 prisms, except to notice some error spikes at certain orientations.?ÿ
They measure the effect of not pointing a conventional prism at the EDM, and also note that a front surface reflection can cause significant error with some prisms if they are too exactly pointed.
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Sir, every time I read your posts about mathematical things I am amazed and really wonder about your math background. My entire family is math oriented. I am the low person on my family totem math.
I been surveying since '85. U inspire me to study and to get these persons around me to be inquisitive.
All are good things.
I have an ms engineering degree and used algebra, trig, random process error theory, and occasional calculus in my work more than the average guy. I"ve always made too many mistakes manipulating equations, and am getting rusty now.
And I'm nowhere near as knowledgeable as mathteacher for breadth in math.?ÿ For ellipses and projections, for instance, I just find somebody's formulas and plug in numbers.
The old math teacher could never settle on a specialization so he wound up 3 miles wide and a foot deep. He envies people who found their niche and pursued it successfully.