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

366 CORK INSULATION
JEWETT SOLID PORCELAIN REFRIGERATORS.
Refrigerator Principles.—Jewett Solid Porcelain refrigerators com-
bine all four basic essentials by which the true value of any refrigerator
may be judged: (1) Absolute sanitation, without which no refrigerator,
regardless of its other features, is safe as a storage place for food; (2)
Efficient <strong>insulation</strong>, an unseen essential which really determines the cost
of operating the freezing unit and the number of years of service it will
render; (3) Perfect circulation, which produces dry, crisp air in the
(4) Durable
refrigerator instead of a damp, mouldy atmosphere ; and
construction, without which a refrigerator soon wears out and is a
poor purchase no matter how cheap its initial price.
TJie Famous Solid Porcelain Interiors.— It is unfortunate that the
descriptions of refrigerator linings have never been standardized like
the nomenclature of bathroom equipment. "Jewett" solid porcelain lin-
ings are moulded from selected clays with a highly glazed china finish
fused on the surface in our pottery. All other so-called "porcelain"
linings are made of thin sheet metal with a coating of enamel painted
or baked on them. There is just as vast a difference between them
and "Jewett" linings as between a solid porcelain bathtub and an enam-
eled iron one.
These solid porcelain linings are an inch and a quarter thick and
even without the super-<strong>insulation</strong> that surrounds them, these crocks alone
would store up the cold and maintain low temperatures more uniformly
than most <strong>complete</strong> refrigerators.
Insulation.—The illustration shows the construction of the walls, floors
and ceilings of "Jewett" solid porcelain refrigerators. The aggregate
thickness is S-Y% inches, which is almost double the thickness of tTie
wall construction used in any other refrigerator.
The exterior case is of solid ash, carefully doweled and glued ; next
come two courses heavy waterproof insulating paper, then a 1-inch sheet
of pure cork, then two more courses heavy waterproof insulating paper,
then a course of ^-inch tongued and grooved lumber, then \y^ inches
more of pure cork, then a course of waterproof insulating paper, then the
solid porcelain lining 1-^ inches thick.
Outside of the two courses of lumber necessary to give the proper
strength and rigidity, the <strong>insulation</strong> of the "Jewett" solid porcelain re-
frigerator consists entirely of pure cork, which is the most efficient form
of <strong>insulation</strong> known.
Circulation.—A dry atmosphere in a refrigerator is essential for the
preservation of food. In a refrigerator with poor or no ciculation, all
things are damp, moist and moldy. Then there is an odor. Dryness
prevents all these things.
The cold air ducts and warm air flues in the "Jewett" solid porce-
lain refrigerators are designed to take advantage of the well-known
principle that cold air falls and warm air rises. On account of its
greater weight, the cold air descends from the ice compartment into the
food compartment below, and forces the warmer air in the upper part