Such a symbolic product, if its does not vanish identically, denotes an invariant or a covariant, according as factors az, bz, cz,...
1 Bz 2 ...
1 Bz 2.1 Abz.
(p -a)(b2 -a2) U i p(b2 +a2) +0-(b2-a2)' (23) (19) (21) (14) (15) (16) X =-7rUa U, U -p(bz +a2) +0_(b2-a2), 2g 2g, (3) so that cavitation will take place, unless the head at a great distance exceeds this loss.
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