318 G. H. KNIBBS. 
For engineering requirements, pg/8y, may be put as a single 
factor, g being taken as 980-6, and p as ‘999. Hence for centi- 
metre units for velocity and radius, and for metre units, we have 
respectively 
Dom = 6844 fL Ri, (4) 
U,, = 684400 fI R3, (5) 
Jf denoting the relative fluidity, viz., the quantity expressed in 
brackets in formule (2) and (3). The results by these formule 
would be excessively great if they were generally employed, that 
is if they were used where the flow is non-linear or turbulent ; for 
it is this latter condition that usually exists in cases with which 
engineers are concerned. 
4. Values of the fluidity and viscosity.—In all computations the 
results of which are subsequently given, the following values of 
the fluidity, and of the reciprocals of the viscosity are used. Both 
the natural numbers and their logarithms are entered so as to 
TABLE I. 
Relative fluidity (/), and reciprocals of the viscosity (= et 
water from 0° to 39° C. C.G.S. units. : : 
Temp. f. log. f. = log. oe J. = Jog. f. 8S log. > 
\ ; 7 
0° 1:000 0000 55-89 1:7474 | 20° 1-770 -2480 98-93 1-9953 
1-033 0141 57-74 1:7615 | 21 1-814 -2586 101-39 2:0060 
1:067 -0282 59-64 1-7756 | 22 1-858 -2690 103-85 2:0164 
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