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 435
marked f, which isnot quite so hard, and, consequently, admits of shading withgreater rapidity. The young gardener, in using these or anyother pencils should be careful not to put the lead to his mouth,or otherwise wet it, as this ends in glazing the lead and prevent-ing it from marking the paper… … 16 ft. high, 4 in. diam.
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