. Better fruit. Fruit-culture. ipi8 BETTER FRUIT Page 25 vided there were no prolonged periods of warm weather. But prolonged warm periods do occur and they make the application of some form of insulation necessary. One of the best insulating materials available is dead air (still air). The only way in which we can maintain a dead air space within a wall is to con- fine the air within minute areas between bits of other material. Fortunately a cheap and effective material is avail- able, namely, mill shavings. In a paper read before the American Warehouse- men's Association a good many years ag
. Better fruit. Fruit-culture. ipi8 BETTER FRUIT Page 25 vided there were no prolonged periods of warm weather. But prolonged warm periods do occur and they make the application of some form of insulation necessary. One of the best insulating materials available is dead air (still air). The only way in which we can maintain a dead air space within a wall is to con- fine the air within minute areas between bits of other material. Fortunately a cheap and effective material is avail- able, namely, mill shavings. In a paper read before the American Warehouse- men's Association a good many years ago George H. Stoddard presented sec- tional diagrams of walls insulated with shavings, with hairfelt, with granulated cork, and with alternate layers of % inch spruce and % inch air space. His diagrams were the result of tests which he had made on sections of walls built of the above materials. He concluded that an 8-inch layer of mill shavings is the equivalent of 4;i„ inches of hair felt, 6% inches of granulated cork, or five layers of Ts-inch spruce separated by %-inch air spaces. In a wall sixty feet long and ten feet high the hair felt costs •*.">3, the granulated cork costs $90, and the spruce costs $95 (Yakima prices), while the shavings cost only $10 plus the cost of transportation. Insulating material must be dry when applied and it must be kept dry after it is put into a wall, or it will lose its insulating value. Shavings in walls can be kept dry by lining the inside of the retaining wall with odorless waterproof paper. Wher- ever the workmen tear the paper, they should replace the torn sheet with an unbroken one, or patch the hole so that air cannot enter. The paper should be lapped at all joints so as to thoroughly exclude outside air. There is some tendency for apples to shrivel in air-cooled storage, the ser- iousness of the shriveling varying with the variety of apple, the temperature maintained, the operation of the venti- lators and the provisions t
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