36«
Molesworth’s pocket-book
GAS-WORKS.
Each lamp consumes 5 cubic feet per hour.
, cub. ft. per month.
In winter each lamp consumes from 1800 to 2500
In summer „ „ 1000 „ 1800
cub. ft. per year.
Average consumption for each lamp = 21,000
Private burners, average about .. .. 5,000
Internal lights require 4 cubic feet of gas per
hour, and external lights about 5 cubic feet per
hour. Where large or Argand burners are used,
from 6 to 10 cubic feet will be required.
. The pressure with which gas is forced through
pipes should seldom exceed 2| inches of water at
the works, or the leakage will exceed the advan-
tages, to be obtained from increased pressure.
It is usual to place a governor at every 30 feet
change of level.
When pipes are laid at an inclination either
above or below the horizon, a correction will have
to be made in estimating the supply, by addin»
or deducting of an inch from the initial
pressure for every foot of rise or fall in the length
of the pipe.
A retort produces about 600 cube feet of gas in
5 hours with a charge of about 1J cwt. of coal, or
2800 cube feet in 24 hours.
In estimating the number of retorts required,
|th should be added for being under repairs, &c.