The lime should be slaked a short time before use. The
sulphate, lime, and sufficient water to moisten the whole are ground into a
pulp and left to dry. The dry mixture, which has a reddish-yellow colour,
is broken up fine. Put tray B1 into place and spread half the chemical over
it; then lay B on the top and cover it with the remainder. The lid joint is
sealed by a broad rubber band.
While passing through the tin, the ammonia, sulphuretted hydrogen and
carbonic acid gases all combine with the chemical, and fairly pure gas
issues from the outlet.
The Gasholder.--As the gasometer is an important feature of a gasworks,
our small plant should contain its counterpart, as it serves to regulate
the pressure of the gas, and, therefore, the steadiness of the flame, as
well as affording storage room.
As a gasometer, one may use a container made on the principle of the
lung-testing apparatus described on p. 361; or the gasholder of a lantern
acetylene apparatus, which must, of course, be suitably counterweighted.
Working the Plant.--When starting up the plant, leave the burner open
until inflammable gas issues, so that the air present in the various
chambers may be displaced.
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