The crank is then turned, by which the bag is wrung,
and the emulsion squeezed through the meshes immediately into the water.
When this process is continued until the purse between n and g h feels
like a metal rod, the best part of the emulsion has been squeezed
through, and if one now take out the bag and dissolve its contents, it
will be found that the loss of emulsion is almost _nil_.
[Illustration: FIG. 2.]
It may be remarked that the whole apparatus, with the exception of the
crank, must be coated with asphalt varnish; also that the corners, r and
q, must be separated off from the purse, as shown by the dotted line, s
s s s, otherwise the emulsion would lodge there without being squeezed
through. Instead of g h a strong glass rod may be used for small
apparatus; but for large apparatus it is indispensable, as the power
that requires to be exerted would be far too great for glass.
IV.--WASHING APPARATUS.
The fundamental idea of the apparatus shown in Fig. 3 first occurred
to Herr Jos. Junk, of Berlin. In the present form all the subsequent
improvements made by Herren Carl Such, Paul Grundner, and others are
incorporated. It may be described as follows:
A tin vessel, the bottom of which sinks at e into the shape of a funnel,
rests upon strong iron feet, f f, and is covered with a lid, having a
double edge closing it light-tight.
Pages:
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96