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 489
n,set up the staff in b (another point in the intended arc) withthe base pointing to a. Then measure the distance from b to a(say 50 links); and let an assistant be directed to put in a pegin r, forming a right angle with the line 6 a, at a certain ratiofrom b (say 5 links). Raise the cross staff… … 464 New Mode of forming curved Lines,
