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Roper's questions and answers for stationary and marine engineers and electricians, with a chapter on what to do in case of accidents (1900)

Roper, Stephen. [from old catalog], Keller, Edwin Robert, 1869- ed, Pike, Clayton Warren, 1866- · Philadelphia, D. McKay · leaf 289

An illustration from Roper's questions and answers for stationary and marine engineers and electricians, with a chapter on what to do in case of accidents, 1900, leaf 289
Q. Draw the connections for an annunciatorsystem.A. … AMtomttfte Signal Bell. Q. What is an automatic set-back, and how isit arranged ? A. An automatic set-back is a device by which STEAM ENGINEERS AND ELECTRICIANS. 275 an annunciator shows only the last call which hasbeen made. This is accomplished by an auxil-iary electro-magnet placed in the…

Steam engineering · Electrical engineering

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