A longitudinal groove is sawn in the top of the bed, as indicated
by the dotted line in Fig. 51, to give room for the connecting rod in its
lowest position, and a cross groove is scooped in line with the crank shaft
to accommodate the lower part of the crank disc and the big end of the rod.
(If the wing W under the cylinder is screwed to the side of the bed,
instead of passing through it, as shown, a slight cutting away of the edge
will give the necessary clearance in both cases. )
[Illustration: FIG. 52.--Plan of simple reciprocating steam engine.]
The cylinder and valve tube A should be flattened by filing and rubbing on
emery cloth, so that they may bed snugly against one another and give a
good holding surface for the solder. A steam port, S P, should next be
bored in each, and the "burr" of the edges cleaned off carefully so as not
to obstruct valve or piston in the slightest degree. "Tin" the contact
surfaces thinly, and after laying valve tube and cylinder in line, with the
portholes corresponding exactly, bind them tightly together with a turn or
two of wire, or hold them lightly in a vice, while the solder is made to
run again with the aid of a spirit lamp.
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