What is a quick and effective way of determining whether or not a boiler water gauge glass is operating properly?

Question

Accepted Answer

Quickly opening and then reclosing the gauge glass drain valve.

Answer

Quickly opening and then reclosing the gauge glass lower root valve.

Answer

Watching for the level to fluctuate in the glass corresponding to ship movements such as pitching.

Answer

Quickly opening and then reclosing the gauge glass upper root valve.

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