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Show ( I4l As now on grafs, with glo:ffy folds reveal' d, 3 45 ·Glides the bright ferpent, now in flowers conceal' d · ' Farr thine the fcales, that gild his finuous back; And lucid undulations mark his track· ' So with ihong ann immortal BRINDLEY leads His long canals, atid parts the velvet meads ; Winding in lucid lines, the watery tnafs Mines the firni rock, or loads the deep n1orafs, With rifing locks a thoufand hills alarms, 350 Flings o'er a thoufand fireams its fi.lver arn1s, Feeds the long vale, the nodding woodland laves, 355 And Plenty, Arts, and Con11nerce freight the waves. -NYMPHs! who erewhile round BRINDLEY's early bier On fnow-white bofoms lhower' d the ince:ffant tear ' , Adorn his tolnb !-oh, raife the marble bufl:, , Proclaitn his honours, and -protet1 his dufl: ! With urns inverted, round the facred finine 1"'heir ozier wreaths let weeping Naiads twine ; While on t~le top MEcHANic GENius fiancls, Counts the Beet waves,. and balances the lands. [ 143 ] X. "NYMPHS l YOU fidl: taught to pierce the fee ret caves Of humid earth, and lift her ponderous waves ; 3 66 Bade with quick {hoke the Diding pifl:on bear 'fhe view lcfs columns of incumbent air ;- Prefs' d by the incumbent air the Roods below, Through opening valves in foaming torrents Row, 3'70· Foot after foot with le:ffen' d impulfe move, And rifing feek the vacancy above.- So when the Mother, bending o'er his channs, Clafps her fair nurfeling in delighted arms ; Lift her ponderous waves. 1. 366. The invent.ion of the pump is of very antient date,. being afcribed to one Ctefebes an Athenian, whence it was called by the Latins mach ina Ctefebiana; but it was long before it was known that the afcent of the pifl.on lifted the fuperincumbent column of the atmofphere, and that then the preffure of the furrounding air on the furface of the well below forced the water up into the vacuum, and that on that account in the common lifting pump the water would rife only about thirty-five feet, as the weight of fuch a column of water was in general an equipoife to the furrounding atmoCphere. The foamy appearance of water, when the. preff~re of the air over it is diminifl1ed, is owing to the expanfi.on and efcape of the a1r prevwufly diffolved by it, or exifl.ing in its pores. When a child firfl. fu cks it only preffes or champs the teat, as obferved by the great Harvey, but afterwards it learns to make ;m incipient vacuum in its mouth, and atls by removing the pre!fure of the atmofphere from the nipple, like a pump. |
