Surveying for Archæologists 1

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IV. Simple Instruments for Measuring both Magnetic Azimuth and Altitude. ALTHOUGH undoubtedly for final observations at any monument a theodolite must be employed, using the sun or a star in order to obtain astronomicalor true bearings and so avoid all magnetic difficulties, and reversing the telescope to secure the correct altitude of the horizon; for rapid surveys there are many handy forms of instrument by means of which preliminary information can be gathered, both with regard to azimuth and, what is equally important, the angular height of the horizon.

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LOCKYER, N. Surveying for Archæologists 1 . Nature 78, 542–544 (1908) doi:10.1038/078542a0

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