In E the bell of a rising holder of the
ordinary typo is provided with a horizontal striker which, when the bell
descends, presses against the top of a bag _g_ made of any flexible
material, such as india-rubber, and previously filled with water. Liquid
is thus ejected, and may be caused to act upon calcium carbide in some
adjacent vessel. The sketch is given because such a method of obtaining
an intermittent water-supply has at one time been seriously proposed; but
it is clearly one which cannot be recommended.
[Illustration: FIG. 3.--TYPICAL METHODS OF AUTOMATIC GENERATION
CONTROLLED BY A FLEXIBLE DIAPHRAM OR BAG.]
ACTION OF WATER-TO-CARBIDE GENERATORS.--Having by one or other of the
means described obtained a supply of water intermittent in character, it
remains to be considered how that supply may be made to approach the
carbide in the generator. Actual acetylene apparatus are so various in
kind, and merge from one type to another by such small differences, that
it is somewhat difficult to classify them in a simple and intelligible
fashion. However, it may be said that water-to-carbide generators,
_i.e._, such as employ water as the moving material, may be divided
into four categories: (F^1) water is allowed to fall as single drops or
as a fine stream upon a mass of carbide--this being the "drip" generator;
(F^2) a mass of water is made to rise round and then recede from a
stationary vessel containing carbide--this being essentially identical in
all respects save the mechanical one with the "dip" or "dipping"
generator shown in A^2, Fig.
Pages:
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191