Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 187
he direction of the arrow,/is drivenby friction in the opposite direction, and therefore the 174 OFFICE TESTING. paper between the two rollers is drawn out in the direc-tion of the arrow. The roller f can be lifted by thehandle d ; it will be convenient to do so when introducingthe paper between… … pressed against the paper at this point, can produce anaccurate mark. The paper guide c must have its adjustable washers soarranged that the tape is directed to the middle of thefriction rollers, or better, that the mark is made in themiddle of the paper. Further the two washers of theguide c…
Telegraph · Telegraph lines
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