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John Michell lecture
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Re: John Michell lecture
May 10, 2016, 13:36
I was asking what type of instrument you use , that's all .

What do you do with the info ?

There are various methods of finding the alt remotely .
Thom and others managedit fine decades ago , but we have a greater number of options available to us now .
A combined approach is even more useful for double checking .
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