The casing was made from two aluminum cake pans whose diameter was
8 in. at the base, increasing to 9 in. at the rim. The centers of
these were located and a 1/4-in. hole drilled for the

[Illustration: Fig. 3]

shaft. The disks P are the same as used on the wheel. Six holes
1/8-in. in diameter were drilled through the flat part of the rims
while the two halves were held together in a vise. Bolts were
placed through these holes to join the casing when ready for
assembling. One side of the casing was then bolted to two 4-in.
ordinary metal shelf brackets which were

[Illustration: Details of Motor]

screwed to a substantial wood base. This kept one-half of the
casing independent of the main structure so that the wheel is
easily accessible.

The nozzle was made of 1/2-in. brass pipe which was first filled
with molten babbitt metal. When the metal was cool, a 1/4-in. hole
was drilled halfway through the length of the tube, the hole being
continued through to the other end by means of a 1/8-in. drill.
The lower orifice was then slightly enlarged with a small taper
reamer, and the upper portion of the bore was reamed out almost to
the brass to make a smooth entrance for the water.

A fixture to hold this nozzle is shown in Fig. 3. It was cast of
babbitt metal in a wood mold. The hole for the nozzle was drilled
at an angle of 20 deg. to the plate part. An alternative and
perhaps easier way would be to insert the nozzle in the mold at
the proper angle and cast the metal around it. A hole was then cut
in one of the sides of the casing at a point 2-7/8 in. along a
horizontal line from the center. The nozzle fixture was then
bolted on with the exit orifice of the nozzle pointing downward
and through the hole in the casing.

Six 1/8-in. holes were drilled through the flat portions of the
rims while the two halves of the casing were held securely
together in a vise. Bolts were used in these holes to join the
casing.

The wheel was used on the dripboard of a kitchen sink and no
provision was made to carry off the spent water except to cut two
1/2-in. holes in the bottom of the casing and allowing the waste
to flow off directly into the sink.
--Contributed by Harry F. Lowe, Washington, D. C.

** Device for Baseball Throwing Practice [312]

Anyone training to be a baseball player will find the device shown
in the accompanying illustration a great help

[Illustration: Ball Bounding on Concrete Slabs]

when pract