When the adjustment is satisfactory, screw the coil down
tightly, and cut off any superfluous parts of the rod.
The Connecting Rod.--Bore a hole near the end of the plunger for a screw
to hold the rear end of the connecting rod. Pull the plunger out till 1-3/4
inches project, turn the crank full forward, and measure off the distance
between the centres of the plunger hole and the crank pin. Drive a couple
of wire nails into a board, and twist the ends of a piece of 1/20-inch wire
round them twice. This wire constitutes a connecting rod amply strong
enough to stand the pulls to which it will be subjected. Fix the rod in
position.
Adjusting the Wipe.--Turn the wipe, W, round until it makes contact with
B2, and, holding the crank shaft with a pair of pliers, twist the crank on
it till it just begins the return stroke. Then turn the crank to find out
how long the wipe remains in contact, and adjust the crank relatively to
the wipe so that the crank is vertical when the period of contact is half
finished. The length of this period is controlled by the set screws at the
free end of B2.
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