Датотека:EB1911 Telegraph - Modern “Sounder”.jpg

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EB1911_Telegraph_-_Modern_“Sounder”.jpg ‎(633 × 446 piksela, veličina datoteke: 102 kB, MIME tip: image/jpeg)

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Opis
English: The modern pattern of “sounder” as used by the British Post Office for reception of telegraphy. Dots and dashes are distinguished by the interval between the sounds of the instrument. It consists only of an electromagnet, with its armature lever arranged to stop against an anvil or screw in such a way as to give a distinct and somewhat loud sound. The magnet is wound to a resistance of 40 ohms (or 900 ohms when worked from accumulators), and the instrument is worked with a current of 400 milliamperes (25 milliamperes with accumulators).
Datum published 1911
Izvor Encyclopædia Britannica (11th ed.), v. 26, 1911, “Telegraph,” p. 516, Fig. 15.
Autor Harry Robert Kempe (section author)
Dozvola
(Ponovno korišćenje ove datoteke)
Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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trenutna21:38, 18. februar 2016.Minijatura za verziju na dan 21:38, 18. februar 2016.633 × 446 (102 kB)Library Guy{{Information |Description ={{en|1=The modern pattern of “sounder” as used by the British Post Office for reception of telegraphy. Dots and dashes are distinguished by the interval between the sounds of the instrument. It consists only of an el...

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