Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 126
This concave surface gives strength to the radiators, and adds much to their radiating power. Theentire thickness of the radiator is about half an inch. On one of the lower corners of the radiatorsis a valve to open when steam is to be admitted, and closed when steam is to be excluded. An air-key…
Mechanical engineering -- Dictionaries
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