NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lehmann's Rules and surveying
From: Peter Fogg
Date: 2007 Mar 17, 18:37 +1100
From: Peter Fogg
Date: 2007 Mar 17, 18:37 +1100
Richard
In practice this application of Lehmann's Rules was a necessary part of setting up the plane table; of ensuring correct orientation.
Once correctly carried out, positions lines DID meet at a point - this was a given. If they didn't then it just indicated error in the setting up process.
My main source for this:
Clark D (Fourth edition revised by Clendinning J). 1949. Plane and Geodetic Surveying for Engineers. Constable & Co Ltd. London.
Chapter VII is entitled Plane Table Surveying and pp 346 deals specifically with Lehmann's Rules.
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In practice this application of Lehmann's Rules was a necessary part of setting up the plane table; of ensuring correct orientation.
Once correctly carried out, positions lines DID meet at a point - this was a given. If they didn't then it just indicated error in the setting up process.
My main source for this:
Clark D (Fourth edition revised by Clendinning J). 1949. Plane and Geodetic Surveying for Engineers. Constable & Co Ltd. London.
Chapter VII is entitled Plane Table Surveying and pp 346 deals specifically with Lehmann's Rules.
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To unsubscribe, send email to NavList-unsubscribe@fer3.com
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