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

REFRIGERATED SODA FOUNTAIN 407
temperature of 0° to 5° F. is maintained. The Frigidaire boiler producing
this temperature is automatically controlled by the compressor itself.
Separating the brick compartment from the bulk compartment at its
left is a correctly proportioned baffle partition which permits the exact
amount of refrigeration in order that the bulk cream may be kept at a
temperature of from ten to twelve degrees above zero.
The syrup unit secures its refrigeration through copper conductor
plates attached to the bottom of the syrup unit lining and extending down
into the brine of the bulk compartment. The refrigeration necessary to
produce a temperature of from twenty to thirty degrees under the room
temperature of from ten to twelve degrees above zero. The bulk
compartment and storage refrigerator are separated by a 2i/2-inch
corkboard partition.
Study well the illustrations in Fig. 193. Take note of the arrangement
and the method and system of operation of the refrigerating unit,
and remember that continuous operation and efificient functioning requires
the utmost in simplicity and practicability of construction, all so clearly
shown in Fig, 193.
FIG. 194.—CORKBOARD INSULATED CREAMER.
Creamer.
Frame.— Constructed of genuine Louisiana red cypress, a product of
the Southern swamps, inured to all kinds of weather, accustomed to moist-
ure and exposure and, above all, possessing a long life. Front and rear
paneled, tenoned, glued and nailed to a chestnut supporting frame, all
thoroughly impregnated with preservative paint, making it truly the "box
eternal."
Insulation.—In addition to the 1-inch cypress walls the <strong>insulation</strong> con-
sists of 3-inch pressed pure corkboard, all joints cemented with a spe-
cially prepared cork cement, making a jointless wall. Insulating qualities
of corkboard are based on the natural quality of the cork plus the dead
air space so long in use as a barrier of heat. The cork is pressed into
a board under heat and the natural resin cements the cork together, impris-