Where an oven or drying chamber is used continuously, it should be
jacketed with slag wool or boiler composition, but for many purposes
this is no advantage. As an example both ways, I will instance the
drying of founders' cores where there is only one blow per day. The
cores of an ordinary foundry can be dried by gas in a common sheet iron
even in about half an hour; any accumulation of heat after that time
would be useless, and a jacketed oven would be of no advantage.
For the disinfection of clothes in vagrant wards and hospitals for
infectious diseases, on the contrary, a continued heat is necessary, and
in this case the accumulation of reserve heat, which takes place slowly
in a jacketed oven, becomes of value, as the gas can be turned low or
out, and the ventilators closed, insuring a more complete disinfection
with a much smaller gas consumption. Where an oven or heated chamber is
much used for periods of over half an hour at once, a non-conducting
casing pays well by reduced gas consumption.
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