Two of these are to be inside and two outside of the frames (one
to bear against each side of each crosspiece). Fasten these to the
crosspieces by means of tacks to hold them securely. Pour melted
babbitt metal into the 1/4-in. hole to form the bearings. When it
has cooled, remove the cardboard, take down the crosspieces, and
drill a 1/8-in. hole from the top of the crosspieces through the
babbitt for an oil-hole.
Secure sufficient sheet zinc to cover the sides of the frame. Cut
the zinc to the same shape as the frame and let it extend down to
the crosspieces EE. Tack one side on. (It is well to tack strips
of heavy cloth--burlap will do--along the edges under the zinc to
form a water-tight joint.) Fasten the crosspiece over the zinc in
its proper position. Drill a hole through the zinc, using the hole
in the crosspiece as a guide. Then put the wheel in a central
position in the frame, tack the other side piece of zinc in place
and put the other crosspiece in place. Place the two collars
mentioned before on the shaft, and fasten so as to bear against
the crosspieces, in order to prevent the wheel and shaft from
moving sidewise.
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