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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

   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 erosion of a boiler's plates from the internal water space, particularly where there is a step inside the shell.

4. Boiler - Wikipedia

   en.wikipedia.org/wiki/Boiler

   Water level indicators: They show the operator the level of fluid in the boiler, also known as a sight glass, water gauge or water column. Bottom blowdown valves: They provide a means for removing solid particulates that condense and lie on the bottom of a boiler.

5. Steam locomotive components - Wikipedia

   en.wikipedia.org/wiki/Steam_locomotive_components

   Boiler Horizontal tubular vessel, strong enough to contain high-pressure steam in a harsh working environment; closed at either end by the firebox and tube plate. 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

6. Package boiler - Wikipedia

   en.wikipedia.org/wiki/Package_boiler

   The burner and centrifugal blower is at the left. Two vertical water level gauges can also be seen. A package boiler is a factory-made boiler. Package boilers are available in a range of standard designs. Package boilers are used for heating and act as a steam generator for small power purposes such as self-powered industrial plants. Package ...

7. Glossary of rail transport terms - Wikipedia

   en.wikipedia.org/wiki/Underbody

   Water gauge or water glass A water gauge A device to enable an engineman or fireman to observe the height of water in a locomotive boiler. It consists of two brass fittings screwed into the back head, one above the other, and connected by a stout glass tube which communicates, through the fittings, with the water and steam in the boiler.