2.93
Oxide of aluminum 8.97
Calcium oxide 15.95
Magnesium oxide 0.98
Oxides of sodium and potassium 0.47
Carbonic acid 11.35
Sulphuric acid 0.11
Chlorine 0.04
Manganese Traces
------
100.51
Insoluble matter, 64.50 per cent.

_Pipe-Line Leakage_.--There is no measurable leakage from the iron
pipe. By thorough inspection and measurement at the end of two years,
leakage on the wood pipe, between Coyote and Bonito Creek, from the
11-and 12-in. pipe, was found to be as follows:

On 8.6 miles, 11-in. pipe, 146,600 gal. per day = 17,046 gal. per mile.
" 4 " 12 " " 14,829 " " " = 3,702 " " "

The 7-1/2-in. pipe on this section appears to be leaking less than the
12-in. pipe. Inspection and measurement of it are to be made in a short
time.

There is no material leakage from the 10-and 16-in. pipe between Bonito
Creek and Nogal Reservoir, as determined by velocity and volumetric
measurements hereafter described. The greatest probable error in the
velocity measurements would not exceed 1/2 per cent. If such error
existed, and was all charged to leakage, it would amount to but 17,204
gal. per day, or 1,582 gal. per mile, out of a daily delivery of 3,784,000
gal.; but the measured discharge of the pipe, as determined by the
velocity, was 5.84 sec-ft., while the mean maximum volume of this water
over the weir at the end of the pipe is recorded by the weir as 5.88
sec-ft.

From Coyote, east along the railway, the wood pipe is remarkably tight.
The rate of leakage from it, as determined by 600 observations uniformly
distributed, was as follows:

11-in. pipe = 120 gal. per mile per day.
8-1/2 and 7-1/2-in. pipe = 268 " " " " "

The maximum rate on 1 mile was 1,613 gal. The minimum found was zero.

The observations were made by uncovering a joint and measuring the
leakage therefrom for 10 min. A graduated glass measuring to drams was
used. The rate of leakage varied from 5 drops to 45 oz. in 10 min. Of
the joints uncovered 57% was found to be leaking. It is rather
remarkable that, in the large leakage of the 11-and 12-in. pipe between
Coyote and Bonito, only one out of every eight joints was leaking. This
indicates a physical defect in such joints. The largest lea