[Illustration: Fig. 55.--Standards of Bedplate.]
The Bedplate.--This should be accurately squared and mounted on its four
arch-like supports. (For dimensions, consult Fig. 55.) Half an inch is
allowed top and bottom for the turnovers by which the supports are screwed
to the bedplate and base. The ends of the longer supports are turned back
so as to lie in front of the end supports, to which they may be attached by
screws or solder, after all four parts have been screwed to the bed. Care
must be taken that the parts all have the same height. Drill all holes in
the turnovers before bending. Use 1/8-inch screws. Turn the bed bottom
upwards, and stand the four supports, temporarily assembled, on it upside
down and in their correct positions, and mark off for the 3/32-inch holes
to be drilled in the bed. A hole 3/4 inch in diameter should be cut in the
bedplate for the exhaust pipe, round a centre 2 inches from the end and
1-5/8 inches from the edge on the fly-wheel side, and two more holes for
the pump.
Making the Cylinder Slide and Valve.--The cylinder barrel must be
perfectly cylindrical and free from any dents.
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