. Science of railways . a flatglass which, owing to its peculiar design, quality and temper,will not blow out under the highest pressures and tempera-tures or under sudden changes of either. The frequent break-age of glass tubes in stationary or marine boiler rooms or inthe locomotive cab often results in injury to men. With theAshcroft prismatic water gauge the danger from flying glassincidental to a gauge glass explosion is Eliminated. The water level is distinctly indicatedatall times. The glass and its casingare so designed that the water showsblack while the steam space takes on asilver a
. Science of railways . a flatglass which, owing to its peculiar design, quality and temper,will not blow out under the highest pressures and tempera-tures or under sudden changes of either. The frequent break-age of glass tubes in stationary or marine boiler rooms or inthe locomotive cab often results in injury to men. With theAshcroft prismatic water gauge the danger from flying glassincidental to a gauge glass explosion is Eliminated. The water level is distinctly indicatedatall times. The glass and its casingare so designed that the water showsblack while the steam space takes on asilver appearance. This makes it impos-sible to mistake the water level, as itis claimed may often be done with theordinary water glas§, particularly if theboiler tends to foam. The frame in which the glass ismounted consists of a front and a backportion, machined to true surfaces,making a perfect joint with the backgasket and front pad and insuring thatmost important condition — tight joints. Ashcroft Pris-matic WaterGauge. BABCOCK SAFETY WATER GAUGE The Babcock water gauge is so constructed as to haveno opening whatever into the cab. When the tubular glassbreaks, every particle of glass is ejected through a pipe thatleads below the deck. The reason why the glass cannotescape into the cab is because there are two windows ofplate glass at each opening instead of only one and the innerglass is fixed at such an angle from the tubular glass thatonly a glancing blow can be struck on it by the particles,of the exploding tube. 138 LOCOMOTIVE APPLIANCES. This breaks the force and the liability of cracking theinner plate; but even if it should be broken it absorbs theforce of the blow and the outer plate still stands to preventthe particles of glass from being blown into the cab. WATER TUBE
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