not seem to affect the pressure to any measurable extent. The
following table contains a list of the more important mains tested,
and it may be mentioned that the resistance, due to the reservoirs,
was at first partially included. The trials were carried out while the
mains were not being drawn upon by subscribers.


-----------------------------------------------------------------------
| |
Section of Mains Tested. | Length. |No. of
| |Tests.
| |
---------------------------------------------------+------------+------
| yards. |
From the central station to the end of reseau and | |
back to central station by return circuit | 18,100 | 7
From the central station to the Rue Fontaine au |\ 14,600 |/ 3
Roi |/ 9,900 |\ 4
From the central station to the Rue de la | |
Charonne | 9,490 | 5
From the Rue de la Charonne to Fontaine au | |
Roi | 4,770 | 3
From the central station to the Avenue de la | |
Republique | 1,860 | 8
Various trials on different lengths of mains |770 to 8,000| 11
-----------------------------------------------------------------------


Over the whole system of 16.5 kilometers, which was also tested when
no air was being taken off, there were four reservoirs of considerable