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A N INTRODUCTION T 0 A General SYS T E M u ±* Hydrostaticks and Hydraulicks. BOOK IV. CHAP. XXX. • id General Introduction concerning the Coming-in of Water from Engines, or Springs, and the Expence thereof in Cafcades and Fountains. T highly behoves allPerfons that would have their Wa terworks to fucceed well, to make the exafteft Calcula tions they poffibly can, what Water their Engine or Spring will fupply them withal; that fo they may re gulate the Extent of their Pipes of Condu&j Sheets, and Jets of Water, &c, fmce it would be a great piflatisfaftion -and 2 2 Reprcacn