56 
BULLETIN 376, U. S. DEPAKTMENT OP AGEICULTUEE. 
Curve of genera 
equa+ion for m' 
Dot-dash shows 
Moritj' and da: 
shows Moore's 
equations for m 
I' 
fr« 
triangles (see^other observations on PL VII) shows that listed tables 
of/ in the Weisbach formula do not extend 
to 144-inch pipes; hence comparison was 
not made with the Weisbach formula 
(column 23, Table 2). 
At the bottom of the chart the reason 
for the blank opposite "Moritz" is quite 
obvious, since this observation was made 
subsequent to his own tests. Opposite 
Scobey's name the heavy upper line 
indicates that all the observations in this 
series received a weight of 3 in determin- 
ing the general value of the intercept 
equation (fig. 4). The light line under 
the heavy one indicates that these obser- 
vations did not receive much weight in 
determining the general value of the 
exponent of V (see p. 51, and column 14 
Table 3). 
At the extreme right of the chart the 
same symbols are used to show the relative 
positions of the mean of all observation 
percentages (see foot of columns 19 to 2? 
inclusive, Table 2) and also the means c 
the average percentages by pipes (see foot 
, of columns 18 to 22, inclusive, Table 3). 
The new formulas and the Moritz form- 
ulas agree for a 4-inch pipe, diverging as 
the diameters increase exactly as do the 
, curves in figure 4. Thus by the time a 
pipe 144 inches in diameter is reached the 
Moritz formula shows 20 per cent greater 
, capacity than that shown by the new 
formulas while a glance at the larger 
sizes of pipes (PL VII) shows that even 
the new formulas give a greater carrying 
capacity than observations on most pipes 
larger than 24 inches would promise. 
rn = 7.68 cT 
-1.17 
i : (TScobev) 
m--8.3d-'- 20 
• (Moore) 
(MOritj) 
KUTTER'S FORMULA AS APPLIED TO 
WOOD-STAVE PIPE. 
In discussing the Moritz experiments 
with reference to the value of n in Kutter's 
formula, 
Hering states 1 
that he "recog- 
i Trans. Amer. Soc. Civ. Engin., 74 (1911), p. 
