Ветряные мельницы, страница 6

and bent to make a bracket by which the vane is bolted to the centre line of  the rim.  When all the vc^nes are in

position,  the tips of  the ribs and vanes,  which should previously have been bored or notched,  are connected

together by rings of  stout wire,  soldered on at all contact points.

One of  the spindle nuts—^that which will be on the outside—is screwed hard up against its cone.

a thin washer being interposed (Fig.  68).  The other end of  the spindle passes through one arm of  a stirrup,  F,

made out of  ^in.  iron,  1^ in.  wide,  and a triangular plate,  P,  and is secured by a washer and nut on the inside.

The stirrup and a circular plate,  V,  are bored to take the end of  an iron pipe,  T,  of  ^-in.  bore.  The top of  the hole

in F is chamfered of f ,  and the top of  the pipe red-heated and expanded a little to f it the chamfer.  The parts are

then well cleaned and sweats together with solder,  care being taken that T is square to the stirrup.  Cut the pipe

of f  9 in.  below V.  A small ring soldered to the underside of  V will prevent moisture working along to the pipe T,  4

feet long,  in which T is able to revolve f reely.

The lef t-hand diagram in Fig.  68 shows a side view and the right-hand a back view (as seen f rom the tail) of  the

gearing and supports.  A is the rim and part of  the spokes of  a toothed wheel,  attached at several points to the

spokes of  the cycle wheel.  First f ix A loosely and adjust it until it runs quite true when the wheel is revolved,

without any wobble; th^i secure it.  A drives a smaller cog,  B,  mounted on the same spindle,  a,  as a still smaller

cog,  C.  This spindle revolves in two plates,  P P,  screwed to F.  C drives a large cog,  D,  and an eccentric,  E,  which

moves the eccentric rod,  R,  up and down and works a small pump at the foot of  the mast supporting

224 THINGS WORTH MAKING.

the windmill.  E can be made quickly out of  a thick disc with two larger discs soldered to it.  B is a piece of  stout

brass strip bent round E and closed with a screw.

The tail spar is a wooden bar,  1} in.  by 2} in.y 40 in.  long,  notched to f it the stirrup and tapered of f  towards the

tail,  a sheet of  stout zinc or iron,  15 in.  by 12 in. ,  f itted into a saw cut.  Two bolts clip the wings of  the forked end

tightly against the sides of  the stirrup.  The tail should approximately balance the wheel about the vertical pivot

to avoid stressing the joint at the top of  T.

Vanes,  wheel,  and tail should be given a good covering of  paint to protect them f rom the weather before the

windmill is pkiced on its support.  This is a stout pole,  to one side of  which T is secured by a couple of  strai>s in

such a way that it projects suf f iciently to prevent the vanes fouling.  Three or four guys will make the pole quite

steady.  The circular pump rod attached to R works through eyes in the pole.

A wheel of  this size will spin at great speed in a good wind,  but is able to drive only a very small pump,  which

may be employed to f ill a cistern for a garden fountain or do some other very light work of  a similar character.

The wheel hub should be f illed with a thick grease lubricant and the spindles and eooentrio

supplied with the same.  It is a simple matter to make a small metal hood to cover the working parts and attach it

to the top side of  the tailspar.  The life of  the bearings of  spindle,  a,  will be greatly lengthened if  they be extended

by soldering plates to the sides of  P P so as to distribute the pressure.  A cord is attached to the tail to turn the

motor out of  the wind when it is not required to work.

(%Am 16