. The mastery of water. By courtesy of The Budenberg Gatige^Co., Ltd. A BOURDON PRESSURE GAUGE. All boilers—^and, in fact, aU vessels which are to containliquids and gases under pressure—^are fitted with gaugesto show at any moment what the pressure is. Two formsare in common use, both being very simple in construc-tion. In the Schaffer and Budenberg pattern, a pipe,leading from the boiler, is closed by a disc of metal clippedat the edges. The disc is not fiat, but is stamped witha number of circular troughs and ridges. The effect ofpressure on one side is to straighten these out and bendthe w
. The mastery of water. By courtesy of The Budenberg Gatige^Co., Ltd. A BOURDON PRESSURE GAUGE. All boilers—^and, in fact, aU vessels which are to containliquids and gases under pressure—^are fitted with gaugesto show at any moment what the pressure is. Two formsare in common use, both being very simple in construc-tion. In the Schaffer and Budenberg pattern, a pipe,leading from the boiler, is closed by a disc of metal clippedat the edges. The disc is not fiat, but is stamped witha number of circular troughs and ridges. The effect ofpressure on one side is to straighten these out and bendthe whole plate into the shape of a shallow bowl. The SAFETY VALVES AND THE STEAM ENGINE. 193 greatest movement is, of course, at the centre, and at thispoint the plate is attached to a small rod, which acts ona lever and causes a pointer to turn round. In the Bourdon Gauge, the steam is led into an ovaltube bent into a curve, and closed at the end. Such atube has a smaller volume than a straight one of thesame length, a
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectwatersupply, bookyear
