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 221
Construction of Fountains for Gardens.64 211 … always kept to the same level, need not be above six inches ;but, as it is seldom practicable to keep the head to the samelevel, it is better to have the bottom of the pond or cisternsufficiently high to effect the desired object; in which case,so long as there is any water in the cistern at all,…