This piece must, of
course, cover the steam ports in the cylinder.
(2.) Put pieces aa (Fig. 61) in position, with their tops quite flush with
the tops of BB (Fig. 62), and solder them to the cylinder barrel and sides
of the steam-way piece.
(3.) Solder the valve plate centrally to BB, and to the tops of aa, which
must lie between the central and outside ports. Take great care to make
steam-tight joints here, and to have the plate parallel to the standards in
one direction and to the cylinder in the other.
(4.) Solder in pieces bb. These should be a tight fit, as it is difficult
to hold them in place while soldering is done.
(5.) Bore a 5/16-inch hole in the lower side of the central division and
solder on the exhaust pipe.
Slide Valve.--The contact part of this is cut out of flat sheet brass
(Fig. 63), and to one side is soldered a cap made by turning down the edges
of a cross with very short arms. The little lugs aa are soldered to this,
and slotted with a jeweller's file to engage with notches cut in the valve
rod (see Figs. 58 and 62).
[Illustration: FIG. 63.
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