. Cyclopedia of farm animals. Domestic animals; Animal products. REFRIGERATION OF DAIRY PRODUCTS 237 ing materials used for small refrigerators are numerous. (Fig. 262.) There are some very impor- tant requisites that need to be taken into consider- ation when selecting insulating materials for a refrigerator: (1) They must possess the power to resist heat, or should be non-conductors of heat; (2) they should have a minimum capacity for absorb- ing moisture; (3) they should not fer- ment, disintegrate or decay; these requis- ites being similar to that of the insulat- ing material of the ice-ho
. Cyclopedia of farm animals. Domestic animals; Animal products. REFRIGERATION OF DAIRY PRODUCTS 237 ing materials used for small refrigerators are numerous. (Fig. 262.) There are some very impor- tant requisites that need to be taken into consider- ation when selecting insulating materials for a refrigerator: (1) They must possess the power to resist heat, or should be non-conductors of heat; (2) they should have a minimum capacity for absorb- ing moisture; (3) they should not fer- ment, disintegrate or decay; these requis- ites being similar to that of the insulat- ing material of the ice-house. In con- nection with these, they should be odor- less, so as not to taint the products that are stored in the house ; (4) they should not pack or settle down, thus leaving an air space above; (5) they should be reasonably cheap, and lend to practical conditions. The materials that comply with these conditions are rock cotton or mineral wool. Granulated cork is very effect- ive and charcoal is also used with a great degree of suc- cess. Hair felt is a good insulator, and planer-shavings be- come exceedingly practical because of the cheapness a t which they can be secured. Sawdust is also good, but does not prove to be so effective after a year's use as do planer- shavings. Paperhas frequently been used, but is not to be recommended for all conditions. Air spaces are frequently built in refrigerators for the purpose of insulation. While air may be confined to a particular place, it is very important that the air should be made perfectly "dead" in order to prevent circulation. Variation in tempera- ture induces air to circulate, and the greater the variation, the more rapidly will it circulate. The more rapid the circulation, the poorer will be the insulating effect. Furthermore, air spaces built for insulation are very expensive and impracticable. â¦^âTa itKH q,M boarco- 14-i INCH AIR. SRKES '8IHCH } 4.£1 â¢Â£.95 ^---&quo
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