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 418
, h is an arm carrying an index-pin ?, which arm may be fastened upon / in such posi-tions as to bring the pin i opposite either of the rows of holes upon plate g. A spiral spring at jforces the point i into such of the holes in g as it may be opposite to. Upon the back side of plateg is a pin fr,… … prevent its revolving while using the arm h. Upon the face of the plate g, and held to it by friction,is a sector formed of two arms, which may be opened to any angle, and embrace any number of holesin the plate; and having been set at the requisite number of holes, the pin i may be moved…
Mechanical engineering -- Dictionaries
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