You know what it looks like… but what is it called?
TAKE THE QUIZ“Ramsbottom”
We have one entry that includes the term Ramsbottom.
Ramsbottom safety valve
noun: a safety valve used especially on locomotives in which two valves are pressed down by a single spring attached to a crosspiece prolonged to form a hand lever by which the valves may be eased up to test their adjustment
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Merriam-Webster unabridged