Heating and ventilating buildings : a manual for heating engineers and architects . Fig. 150.—Bourdon Gauge moves the hand an amount proportional to the pressure. Fig. 150 shows the interior of a pressure-gauge of this char- SETTINGS AND 185 acter, the dial being removed. In place of the tube a corrugateddiaphragm is sometimes employed. A section of such a gaugeis shown in Fig. 151. In the use of gauges of the character justdescribed it is necessary to protect them from extreme this purpose when they are connected to a steam-boiler a. Fig. 151.—Diaphragm Gauge. siphon or U
Heating and ventilating buildings : a manual for heating engineers and architects . Fig. 150.—Bourdon Gauge moves the hand an amount proportional to the pressure. Fig. 150 shows the interior of a pressure-gauge of this char- SETTINGS AND 185 acter, the dial being removed. In place of the tube a corrugateddiaphragm is sometimes employed. A section of such a gaugeis shown in Fig. 151. In the use of gauges of the character justdescribed it is necessary to protect them from extreme this purpose when they are connected to a steam-boiler a. Fig. 151.—Diaphragm Gauge. siphon or U-shaped form of pipe is to be used in the connec-tion, so that water and not steam will be forced into the inte-rior of the gauge. The manometers and gauges described in every case measurethe pressure above or below that of the atmosphere. If theymeasure a pressure lower than that of the atmosphere they arecommonly called vacuum-gauges, but the principle of construc-tion is the same as described. The relations of various units used in measuring pressurecan be readily determined from the following table of equiva-lents: 1 inch of mercury = inches of water = feet ofwater= lbs. per sq. in. = 920 feet of air at 60 degrees Fahr-enheit and barometer pressure 30 inches. The pressures areusually taken as acting on one square inch of a body. loo- HEATING AND VENTILATING BUILDINGS.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1910
