Fargeau to the Rue de Belleville, 1.4 kilometers; and from
St. Fargeau to the Rue des Pyrenees, 6.5 kilometers. It will be seen
from the figures given in the table that the actual loss is small, and
it is stated that this is due chiefly to the elastic joint employed
throughout the system, excepting in the Rue de Belleville, where rigid
couplings are used, and continual trouble is experienced from loss by
leakage. In all cases the losses given are the maximum, which only
occur under the most unfavorable conditions.
It was found, during the first, second, and fourth tests, that
considerable leakage occurred between the St. Fargeau central station
and the Rue de Belleville. During the trials two and four, an
uncertain amount of loss occurred from the consumption of air required
to work the pneumatic clocks, and also motors in the circuit, that
could not be stopped. The tests two and four include all losses in the
service pipes, as well as the mains.
The production of compressed air at the central station is assumed at
30,000 cubic feet per hour (atmospheric pressure), and in all cases
the loss in the mains is taken as a percentage of the total
production.
The losses due to resistance in the mains were also examined with
great care, over independent sections, as well as through the complete
_reseau_. During the early part of these trials, an unusual and
excessive loss was recorded, the cause of which could not be at first
ascertained.
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