Fixing the Coil.--Cut a strip of tin 1-3/4 inches wide and 4 inches long.
Punch a couple of holes near one end, and nail this to the side of the
base, with its forward end 4-1/4 inches from the crank shaft. Pass the
strip over the coil, and bend it down towards the base. Drill a couple of
screw holes, and screw the other end down so that the coil is gripped
fairly tight.
Fixing the Plunger. Two small guides, G1 G2, are made for the plunger. The
holes through which the slide rod moves should be a good fit, and their
centres at the level of the centre of the coil. Screw holes are bored in
the feet.
Pass the plunger through the coil, and place the guides on the rod. Then
draw the plunger forward till 1/2 inch projects. Bring G1 close up to it,
mark its position, and screw it to the base. The other guide, G2, should be
1-1/2 inches away from the rear of the coil.
[Illustration: Fig. 38.--Plan of electric reciprocating engine.]
The coil and guides must be adjusted so that the plunger does not touch the
coil anywhere during a stroke, packings being placed, if necessary, under
coil or guides.
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