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that the excess of pressure on the inlet over that on the
outlet shall not exceed one-tenth of an inch of water.
"4. Each meter shall be placed in an iron box, of
suitable construction and made water-tight by proper lids, to
be let into the ground near the foot of the lamp column.
"5. Each lamp shall be furnished with a proper burner,
governor and cock of the best construction.
"Similar burners, governors, and cocks shall be affixed
to all the lamps metered and unmetered.
"Each burner shall be so constructed, as to consume such
quantity of gas per hour as the parish shall determine, with
a pressure beneath the burner corresponding as nearly as
may be to that hereinafter prescribed.
"Each governor shall be so adjusted, as to maintain
beneath the burner to which it is attached such pressure as
will cause the said burner to consume the above-mentioned
quantity of gas per hour, and shall be of such size and
construction as to maintain this pressure, certainly and
uniformily, under the usual variations of pressure in the
mains, and to be in full action whenever the pressure at its
inlet is not less than five-tenths of an inch of water.
"The clear way through the cock when fully open shall
in no part have a sectional area less than one twenty-fifth of
a square inch.
"6. The pressure of gas beneath the burners shall, in
default of any other amount being mutually agreed upon
between the parties, be fixed at two-tenths of an inch of
water.
"7. At intervals, not exceeding three years, every meter
shall be taken out, examined, cleaned, tested, and put in order
if necessary. Testings for friction and for percentage of
c