278 HARRIS, GORTNER, AND LAWRENCE: 
and (6) the resistance due to the passage of the column of water 
of length L — Ly through the conducting tracts. 
Since L — Lo is measured in feet, both of these values should 
be expressed in heights of water column in the same units. Thus 
the increase in atmospheres pressure due to hydrostatic head, H, 
should be given by 
T T 
22 
pg 
o 
x 
= 
Ss 
2/ + S 
tS 
etn.’ 
ao 
ie 
20} 3S 
§ 
te 
oe 
a 
ae 
jg S 
rg 
% 
RD 
JB 
L 
47 fe 
/6F 
4 
’ height in Feet 
l | eee | l 1 1 L ea 1 a t L 1 
JO 20 : 30 40 50 60 
DIAGRAM 2 
