The gardener's magazine and register of rural & domestic improvement (1826)
Loudon, J. C. (John Claudius), 1783-1843, A. & R. Spottiswoode, printer, United States. Patent Office. Scientific Library, former owner DSI · London : Longman, Rees, Orme, Brown and Green · leaf 547
the quadrant in his hand, apply itto his eye, and look along the edge [a b) to the summit of thetree. The plumb-line will cut the graduated edge at the exactnumber of feet that the tree is high. The operator must thenadd the height of his eye from the ground (say about 5 ft.); andhe must also… … At the beginning of a scale of feet {a b) erect the perpendi-cular line a c of a length equal to the distance the station isintended to be from the object viewed. Upon this perpendicularline describe a quadrant, taking the extremity c for the centre.Then lines, drawn from each division of the scale…
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