]
The nozzle should be a straight, tapered tube of some kind--the nose of a
large oil can will serve the purpose. The exit must be small enough to
allow the water to leave it at high velocity; if too large, the efficiency
of the wheel will be diminished. To the rear end of the nozzle should be
soldered a piece of brass tubing, which will make a tight fit with the hose
pipe leading from the water supply. A few small brass rings soldered round
this piece will prevent the hose blowing off if well wired on the outside.
Now comes the boring of the hole for the nozzle. Fig. 106 shows the line it
should take horizontally, so that the water shall strike the uppermost
bucket just below the centre; while Fig. 107 indicates the obliquity needed
to make the stream miss the intervening bucket. A tapered broach should be
used to enlarge the hole gradually till the nozzle projects sufficiently.
If the line is not quite correct, the tip should be bent carefully in the
direction required. One must avoid distorting the orifice, which should be
perfectly circular; clean it out with a small twist drill of the proper
size.
Pages:
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209