MODERN STEAM PRACTICE . 574 The Connections simply consist of a branch piece at the top and bottom of the glass tube , having a flange for bolting to the flat part of the fire - box shell , fitted with a plug tap between the giass and … Fig . 427 . — Glass Water Gauge . * a , Top piece . b , Bottom piece . c , Glass tube . the boiler , with a screwed cap for putting in a fresh tube , and a screwed plug in a line with the passage through the plug tap . By this means a rod can be passed through to clear away any deposit . The…
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