In practice, however, it seems to be found that from 1
to 1.5 parts of soda are needed for every part of carbide.
The apparatus employed is a metal drum supported on a hollow horizontal
spindle, one end of which is closed and carries a winch handle, and the
other end of which serves to withdraw the gas generated in the plant. The
drum is divided into three compartments by means of two vertical
partitions so designed that when rotation proceeds in one particular
direction portions of the two reagents stored in one end compartment pass
into the centre compartment; whereas when rotation proceeds in the
opposite direction, the material in the centre compartment is merely
mixed together, partly by the revolution of the drum, partly with the
assistance of a stationary agitator slung loosely from the central
spindle. The other end compartment contains coke or sawdust or other dry
material through which the gas passes for the removal of lime or other
dust carried in suspension as it issues from the generating compartment.
The gas then passes through perforations into the central spindle, one
end of which is connected by a packed joint with a fixed pipe, which
leads to a seal or washer containing petroleum.
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