may be secured by putting two or three metal pins through
hub and shaft. Adjust the spokes by boring holes for them and
arrange them so that they extend from the center A, like B. The
wheel is then ready for the blades. These

[Illustration: Fig.1; Windmill]

blades should be of sheet metal or thin hardwood. The sizes may
vary according to the capacity of the wheel and amount of room for
the blades on the spokes. Each one is tilted so as to receive the
force of the wind at an angle, which adjustment causes the wheel
to revolve when the wind pressure is

[Illustration: Fig. 2, Fig. 3]

strong enough. Secure the blades to the spokes by using little
metal cleats, C and D. Bend these metal strips to suit the form of
the spokes and flatten against the blades and then insert the
screws to fasten the cleats to the wood. If sheet metal blades are
used, rivets should be used for fastening them.

The stand for the wheel shaft is shown in Fig. 2. Arrange the base
piece in platform order, (J). This is more fully shown in Fig. 5.
On top of this base piece, which is about 36 in. long, place the
seat or ring for the revolving table. The circular seat is
indicated at I, Fig. 1. This ring is like an inverted cheese box
cover with the center cut out. It can be made by a tinner. Size of
ring outside, 35 in. The shoulders are 4 in. high and made of tin
also. Form the shoulder by soldering the piece on. Thus we get a
smooth surface with sides for the mill base to turn in so as to
receive the wind at each point to advantage. The X-shaped piece H
rests in the tin rim. The X-form, however, does not show in this
sketch, but in Fig. 5, where it is marked S. This part is made of
two pieces of

[Illustration: Fig. 4]

2-in. plank, about 3 in. wide, arranged so that the two pieces
cross to make a letter X. When the pieces join, mortise them one
into the other so as to secure a good joint. Adjust the uprights
for sustaining the wheel shaft to the X-pieces as shown at E, E,
Fig. 2. These are 4 by 4 in. pieces of wood, hard pine preferred,
planed and securely set up in the X-pieces by mortising into the
same. Make the bearings for the

[Illustration: Fig. 5]

wheel shaft in the uprights and insert the shaft.

The gearing for the transmission of the power from the wheel shaft
to the shaft calculated for the delivery of the power at an
accessible point below must next be adjusted. The windmill is
intended for installation on top of a buil