79 inches. If the holder stands only 1 foot above the water-level,
then _p_ = 6.79 - (4.54 x 401 (144 - 12)) / (144 x 48^2) = 6.79 -
0.72 = 6.07 inches. The same result can be arrived at without the direct
use of the second member of the formula:
For instance, the weight of the sides immersed is 11 x 4pi x 2.66 = 368
lb., and taking the specific gravity of mild steel at 7.78, the weight of
water displaced is 368 / 7.78 = 47.3 lb. Hence the total effective weight
of the bell is 443 - 47.3 = 395.7 lb., and _p_ = (35.333 x 395.7) /
48^2 = 6.07 inches. [Footnote: If the sealing liquid in the gasholder
tank is other than simple water, the correction for the immersion of the
sides of the bell requires modification, because the weight of liquid
displaced will be _s'_ times as great as when the liquid is water,
if _s'_ is the specific gravity of the sealing liquid. For instance,
in the example given, if the sealing liquid were a 16 per cent. solution
of calcium chloride, specific gravity 1.14 (_vide_ p. 93) instead of
water, the weight of liquid displaced would be 1.14 (368 / 7.78) = 53.9
lb., and the total effective weight of the bell = 443 - 53.9 = 389.1 lb.
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