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 218
32. ; so that, ifone of them be theend of the tape line on a level, or nearly so, with theobservers eye,while the other is the topof a tree, supposed to be growingstraight up, the distance from the eyeto the bole of the tree will be exactlyequal to the distance from the end ofthe tape line to the…
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