Scientific American Supplement, No. 360, November 25, 1882Various
Science
Scientific American Supplement, No. 360, November 25, 1882
Various
Science -- Periodicals
This defecator is a copper pan, eleven feet long and about three feet
wide. At each end of this pan is placed a copper tube three inches in
diameter and closed at both ends. Lying between and connecting
these two, are twelve tubes, also of copper, 1½ inches in diameter,
penetrating the larger tubes at equal distances from their upper and
under surfaces, the smaller being parallel with each other, and 1½
inches apart. When placed in position, the larger tubes, which act as
manifolds, supplying the smaller with steam, rest upon the bottom of the
pan, and thus the smaller pipes have a space of three-fourths of an inch
underneath their outer surfaces.
The cider comes from the storage tank in a continuous stream about
three-eighths of an inch in diameter. Steam is introduced to the large
or manifold tubes, and from them distributed through the smaller ones at
a pressure of from twenty-five to thirty pounds per inch. Trap valves
are provided for the escape of water formed by condensation within the
pipes. The primary object of the defecator is to remove all impurities
and perfectly clarify the liquid passing through it. All portions of
pomace and other minute particles of foreign matter, when heated,
expand and float in the form of scum upon the surface of the cider. An
ingeniously contrived floating rake drags off this scum and delivers it
over the side of the pan. To facilitate this removal, one side of the
pan, commencing at a point just below the surface of the cider, is
curved gently outward and upward, terminating in a slightly inclined
plane, over the edge of which the scum is pushed by the rake into a
trough and carried away. A secondary purpose served by the defecator
is that of reducing the cider by evaporation to a partial sirup of the
specific gravity of about 20° Baume. When of this consistency the liquid
is drawn from the bottom and less agitated portion of the defecator by a
siphon, and thence carried to the evaporator, which is located upon the
same framework and just below the defecator.
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