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#2
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It looks like an Abney Level for measuring vertical angles. I have seen shorter ones, but the idea is to sight through the tube and adjust the protractor needle to vertical. You can do the same thing with a handheld compass with a collumator.
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Terry Warner - 74-????? M151A2 - 70-08876 M38A1 - 53-71233 M100CDN trailer Beware! The Green Disease walks among us! |
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