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Show ENGINEERS FIND i ANSWER TO HOME COOLINGPROBLEM Electrified Propeller Keeps Up Lively Circulation of Air Through House. Engineers know four ways to produce pro-duce a cooling effect tn theaters, hospitals, hos-pitals, factories and other big build-in build-in gg; and, according to the Hollund Institute of Thermology of Holland, Mich., the same' methods might be used in the average home. The ulr conditioning engineer's four ways of making a building "TO degrees cool" when it's swelterlng-hot outdoors, are these: 1. He may pass the air through cold water or cold brine sprays, or over cold coils, or be may combine both these. 2, Be may evaporate water without adding beat to the air or subtracting it a rather complicated mechanical process which results in some cooling. 8. He may reduce the moisture content con-tent of the air by means of cooling below be-low the dew-point, as in a dehumldl-fylng dehumldl-fylng plant, 4. He may, except in the most severe se-vere conditions, create the effect of coolness without an actual drop tn leniperaiure, merely uy uisiuimig equipment to keep the air moving with steady velocity. ' But, for most of us, in our homes, says the Holland Institute of Thermology, Ther-mology, the choice is narrowed down by the fact that all the first three methods require expensive and corn- The Kitchen Fan Draws Off Heat and Odor of Cooking Range. plicated machinery. So, to cool our houses In hot weather, we are limited to air motion. There are three classes of equipment that make this possible. First, there Is the ordinary electric fan. On a hot night it can be turned on and directed upon the members of the family, and the velocity of its air currents will produce a decided cool, lng elTect ; Then there is the simplest kind of "unit ventilator," tntended to be built fitted Into a part of the space of a kitchen window. Any housewife will appreciate Its effects in drawing oil the heat and odor of the cooking range. . But both the fan and the "unit ventilator" ven-tilator" are limited In usefulness. They cannot cool more than one room or a few persons at a time. These limitations do not apply to the third class of home-cooling equipment the new type of heating system equipped with an electrified propeller which keeps lively currents of air circulating through alt the rooms of the home. There are .two kinds of home-heating plants that have this summer-cooling feature, one known as the "vaporalre" "vapor-alre" system, and the other as the "sa-per-circulator." During the winter, their function is to move the warmed air from tbe heat generator through all rooms of the home more rapidly and In greater volume than the ordt- j nary warm air circulating plant will j do. , One consequence of this is that It takes less time to warm up the home j on cold mornings. Also, these systems maintain more uniform temperatures, ! which are the more healthy. . . |