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 896
A similar instrument receives the messages at the other end ofthe line. There is another form of Phelpss instrument, whichconsists of a mouth-piece placed at the upper part of an ovalebonite case containing a bent magnet connected to the bar car-rying the coil behind the diaphragm, the other pole…
Mechanical engineering -- Dictionaries
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