]
Assembling.--The order of assembling is:--Rivet in the bottom; put the
steam-pipe in place; rivet in the top; insert the flue, and screw collar y
to the top; expand the bottom of the flue by hammering so that it cannot be
withdrawn; insert the stays and screw them up tight; silver-solder both
ends of the flue, the bottom ends of the stays, and the joint between
bottom and barrel. The water-tubes are then inserted and silver-soldered,
and one finishes by soft-soldering the boiler top to the barrel and fixing
in the seatings for the water and steam gauges, safety-valve, mud-hole,
filler, and pump-if the last is fitted.
The furnace is lined with a strip of stout sheet iron, 7 inches wide and
19-1/4 inches long, bent round the barrel, which it overlaps for an inch
and a half. Several screws hold lining and barrel together. To promote
efficiency, the furnace and boiler is jacketed with asbestos--or
fire-clay round the furnace--secured by a thin outer cover. The enclosing
is a somewhat troublesome business, but results in much better steaming
power, especially in cold weather.
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