This ash which
remains is essentially slaked lime and can often be disposed of to more or
less advantage to be used in mortar, whitewash, marking paths and any other
use for which slaked lime is suited. The disposition of the ash depends
entirely on local conditions. An average analysis of this ash is as
follows:
Sand....................... 1.10 per cent.
Carbon..................... 2.72 "
Oxide of iron and alumina.. 2.77 "
Lime....................... 64.06 "
Water and carbonic acid.... 29.35 "
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100.00
GENERATOR CONSTRUCTION
The water for generating purposes is carried in the large tank-like
compartment directly below the carbide chamber. See Figure 11. This water
compartment is filled through a pipe of such a height that the water level
cannot be brought above the proper point or else the water compartment is
provided with a drain connection which accomplishes this same result by
allowing an excess to flow away.
The quantity of water depends on the capacity of the generator inasmuch as
there must be one gallon for each pound of carbide required. The generator
should be of sufficient capacity to furnish gas under working conditions
from one charge of carbide to all torches installed for at least five hours
continuous use.
After calculating the withdrawal of the whole number of torches according
to the work they are to do for this period of five hours the proper
generator capacity may be found on the basis of one cubic foot of gas per
hour for each pound of carbide.
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