Cork insulation; a complete illustrated textbook on cork insulation ...

346 CORK INSULATION
quickly form a puddle of water on the table top; and just as
water vapor in suspension in the surrounding air of the
kitchen would be precipitated on the cold, outer surface of
the pitcher containing the low temperature mixture, at a rate
too rapid to permit of its being evaporated away as fast as
it formed, so would water A'apor have been condensed at the
same rate on the outer, exposed surface of the interior lining
of a refrigerator chilled to the same degree by a mechanical
household refrigerating machine.
FIG. 161.—THE SWEATING PITCHER OF ICE WATER POINTED THE WAY
TO THE PROPER APPLICATION OF CORKBOARD IN
HOUSEHOLD REFRIGERATORS.
In either case, the only difference between the action of
the pitcher and that of the refrigerator would be in the rate
of evaporation of the condensed water; evaporation from the
surface of the pitcher would be more rapid than from the
exposed surface of the interior lining of the refrigerator,
because there would be greater freedom of air currents about
the pitcher than there would be about the confined interior
refrigerator lining.
The foregoing explains why the mechanically cooled household
refrigerator frequently "leaked," and why the former
ice-cooled domestic refrigerator rarely if ever gave evidence
of the same defect ; the rate of condensation of water vapor
in the case of the mechanical refrigerator was considerably
greater than the rate of evaporation, whereas the rate of con-
densation in the case of the ice-cooled refrigerator was usually
;