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2. Sight glass - Wikipedia

   en.wikipedia.org/wiki/Sight_glass

   Water gauge on a steam locomotive. Here the water is at the “top nut”, the maximum working level. Note the patterned backplate to help reading and toughened glass shroud. A sight glass or water gauge is a type of level sensor, a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within.

3. Glossary of boiler terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_boiler_terms

   tapered thermic syphon water-tubes inserted in the furnace of a Lancashire boiler. Gauge glass part of the water level gauge, which normally consists of a vertical glass tube connected top and bottom to the boiler backplate. The water level must be visible within the glass at all times. [3] Grooving

4. Mount Savage Locomotive Works - Wikipedia

   en.wikipedia.org/wiki/Mount_Savage_Locomotive_Works

   Engine safety appliances were sparse. The Bourdon gauge for pressure readings was patented in 1849. A rival gauge was developed in 1857 by Wooten. Glass sight gauges for boiler water level were not popular until the 1890s. Part of the problem was production of the proper glass, and the sealing of the gauge.

5. Steam locomotive components - Wikipedia

   en.wikipedia.org/wiki/Steam_locomotive_components

   Usually well filled with water but with space for steam – produced by heat from the firebox and boiler tubes – to be above the water surface. [1] [2] [5] [3]: 9 Superheater tubes Pass steam back through the boiler to dry and superheat it for greater efficiency. [2] See Superheater (32). Throttle valve (US+) Regulator valve (UK+)

6. Boiler - Wikipedia

   en.wikipedia.org/wiki/Boiler

   Diagram of a water-tube boiler. Water-tube boiler In this type, tubes filled with water are arranged inside a furnace in a number of possible configurations. Often the water tubes connect large drums, the lower ones containing water and the upper ones steam and water; in other cases, such as a mono-tube boiler, water is circulated by a pump ...

7. List of boiler types by manufacturer - Wikipedia

   en.wikipedia.org/wiki/List_of_boiler_types_by...

   three-drum boiler: water-tube boilers with three drums in a triangular arrangement. The best known of these are the Yarrow and Admiralty patterns. Lesser-known examples are the Normand and Mumford. Thornycroft boiler: Several variants of an early naval water-tube boiler. [6] [9] [59] Also a small annular water-tube boiler used in Thornycroft's ...