I came across these marked on some line diagrams recently. Anyone know what 'Pit Fall Posts' were and how they worked?
Jon
Pit fall posts
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limitofshunt
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jwealleans
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limitofshunt
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Re: Pit fall posts
Thanks..... Still doesn't clear up how they worked though 
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jwealleans
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Re: Pit fall posts
As far as I recall you sighted towards them from a given point. If the ground had subsided then the reading against the markings on the post would vary from whatever they were the last time you checked.