Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 183
I70 OFFICE TESTING. Fig. 13 represents a perspective view of the spring drum. YVi. 13. … Let the clockwork run down, remove tlie bracket aby taking out the screw s, remove the steel spring hh bytaking out the screw a, and then take out the ratchetwheel c; the pawl g remains fixed to the plate. Nowremove the covering plate which is fastened by the fourscrews c?, and the drum D…
Telegraph · Telegraph lines
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