For heating blanks for stamping, the furnace bar-burner is perfectly
suited, and in this work the chute supplying the blanks to the machine
should be made of two fireclay sides, with an opening for the flame
between the chute and flame being placed at a sharp angle, to prevent
risk of the blanks sticking or overriding each other. A blowpipe may
also be used with good effect, as shown in the above engraving, and in
many cases it is preferable and much easier to manage.
In some cases the direct contact of the flame would spoil the articles
to be heated, and instead of the arrangement mentioned, a tube of iron,
fireclay, or other suitable material is heated, and the articles are
passed through it. This system of continuous feed, through a tube, has
been applied to the firing of small articles of pottery, and might
possibly be well adapted, among other things, to the production of
gas-burners.
[Illustration: FIG. 4.]
Where the contact of air with the heated articles is injurious, many
plans have been tried to keep the ends closed as much as possible, but I
believe no more perfect and simple seal against the admission of air can
be devised than to turn a jet of pure gas, unmixed with air, into each
end of the tube.
Pages:
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155