Shaft Bearings.--Take a piece of strip brass half an inch or so wide and
3-1/2 inches long. Bore four holes for screws, and scratch cross lines an
inch from each extremity. Turn up the ends at these lines at right angles
to the central part, stand the piece on some flat surface, and on the outer
faces of the uprights scratch two cross lines at the height of the centre
of the cylinder above the bed. Mark the central points of these lines.
Next select a piece of brass tubing which fits the rod chosen for the crank
shaft, and bore in the bearing standards two holes to fit this tubing. Slip
the tubing through the standards and solder it to them. The ends and
central parts of the tubing must now be so cut away as to leave two
bearings, BB--that at the fly-wheel end projecting far enough to allow
the fly wheel, when brought up against it, to just clear the bed; that at
the crank end being of the proper length to allow the eccentric to be in
line with the valve rod, and the crank disc to occupy its proper position
relatively to the central line of the cylinder. Finish off the standards by
filing the tops concentrically with the bearings.
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