COLD STORAGE 103 
The box consists essentially of two boxes separated 
by one-inch strips placed at intervals of about one foot. 
Double thickness of building paper is placed on both 
sides of the strips and tacked to the boxes. A one-inch 
strip, two inches wide, covers the upper space between 
the one-inch strips, thus making a dead-air space between 
the two boxes. The construction of the cover is the 
same as that of the bottom, with the exception that 
there is a flange at the front and sides of the cover. The 
sides, bottom and cover of the refrigerator are built of 
three-quarter-inch tongued and grooved lumber, five and 
a half inches wide. The ends are constructed of one 
and one-eighth-inch tongued and grooved flooring three 
and a half inches wide. The inside of the ice box is 
lined with galvanized iron. A rope provided with a 
heavy weight and running over an overhead pulley, 
makes it easy to raise and lower the cover. A drain is 
provided at the bottom. The cost of such an ice box, 
7X2.5x2.5 feet, is approximately $30, including both labor 
and material. 
The efficiency of the ice box is materially increased 
by filling the one-inch space with granulated cork. 
