. Condensed milk and milk powder, prepared for the use of milk condenseries, dairy students and pure food departments. Condensed milk. 68 Swiilv'I'KNliD CoNDENSliD MiLK—CONDENSING. Fig. 17. Vacuum gauge T]iE rests on top of the body of the pan. It is equipped with a manhole, manhole cover, thermometer, vacuum gauge, sight glasses, lights and blow-down valve, or vacuum breaker. The manhole measures about fourteen to eighteen inches in diameter. It is closed by a solid brass cover with a well-fitting, ground surface flange. The cover carries a five-inch eye- glass or sight-glass through w
. Condensed milk and milk powder, prepared for the use of milk condenseries, dairy students and pure food departments. Condensed milk. 68 Swiilv'I'KNliD CoNDENSliD MiLK—CONDENSING. Fig. 17. Vacuum gauge T]iE rests on top of the body of the pan. It is equipped with a manhole, manhole cover, thermometer, vacuum gauge, sight glasses, lights and blow-down valve, or vacuum breaker. The manhole measures about fourteen to eighteen inches in diameter. It is closed by a solid brass cover with a well-fitting, ground surface flange. The cover carries a five-inch eye- glass or sight-glass through which the operator watches the boiling milk in the pan. The stem of the thermometer is enclosed in a brass casing and reaches to near the bot- tom of the pan. Some processors prefer a short thermometer which registers the temperature of the va- Courtesy ot ArUiur Harris & Co. pors instead of that of the milk. As both, the milk and the vapors are subjected to the same pressure, their respective temperatures are the same. The long-stem thermometer, the bulb of which is submerged in the milk, however, is more sensitive and registers changes in temperature more rapidly, because the milk is a better conductor of heat than the vapors. The vacuum gauge connects with the interior of the pan, and indicates the number of inches of vacuum. A mercury column may be used in the place of the vacuum gauge. In the rear of the dome there are two sight glasses. Throvigh these the interior of the pan is illuminated by means of lamps, gas or electric lights. The "blow-down" valve, or vacuum breaker, serves to admit air into the pan in order to "break" the vacuum. This is necessary for readily drawing ofif the finished con- densed milk. It is further needed to prevent the contents of the vacuum pan from being drawn over into the condenser, whenever the milk rises above a safe level. A further accessory of the dome may be an automatic milk sampler. The sampler tube is carried
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Keywords: ., bookauthorhunzikerottofrederick, bookcentury1900, bookdecade1910
