HYDRODYNAMICS. 



541 



UOOOB of The second Table, which is copied from the origi- the depth of the lower edge of the waste-board below Motion of 



' * nl one used by Mr Smeaton, shews the expence of the level surfaces of the water in the river or re- Wito -m 



j?2 water through a rectangular notch, or over a waste- servoir. The water gauge is nothing move than the ^, fc 



\w_y_ board of different widths and depth*. The term thick- rectangular orifice or notch through which the water ^m*-^~ms 



nebs of water employed by Mr Smeaton, is the same as issues. 



TABLE II. 



Tarfndln* tie Expence of Water by the Water Gauge, having an Aperture of 1,2, 3, G, 12, or 18 luchet in nidlh, 



at any given tkictnett of Water running through the tame. 



