Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)
Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 72
fthe cores, the armatnre is attracted ; while if the magneticeffect is weakened, the spring tension predominates, andthe armature lever banks against the npper stop. Whenthe effects due to the permanent magnetism of the coresand the spring tension are equal, the condition of maximumsensitiveness… … Fic. 3?. —;\I:iKn<-t nnd cores of polarized sounder. required readjustment, with the result that afterwardsunsatisfactory signals were received. This led to thedesign of the pattern shown in Fig. M, which is a modifiedand in some i-espects an improved form of the instrument. The usual adjustable…
Telegraph
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