A Manual of Telephony
A Manual of Telephony
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In our eReader you can find the full English version of the book. Read A Manual of Telephony Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Manual of Telephony
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As indicated by fig. 221, the instrument or operator's peg is composed of four sections two top and two bottom which are joined across in pairs by the double flat springs recessed in L x and L a . A four-conductor cord is used with this peg.
The indicators used for this system are really small non-polarised relays, with long iron-cased coils wound to i, ooo w resistance. In addition to the local INDICA TOR.
287 circuit arrangement, however, there is a conspicuous white needle, which is polarise...d by being pivotted in the forked end of a permanent magnet. This needle, which is actuated by the coils, constitutes the sole indicator for normal use as a means of calling and of indicating the state of a circuit. Shutters are entirely dispensed with, so saving the clerk's labour and time in restoring them after every call. Three positions of the indicator needle are utilised for indicating distinctive signals namely : Fig. 222. Connections of Renter's Telephone.
(1) Deflection to the left, which signifies "engaged" ; (2) Deflection to the right, which is the normal position, and signifies " disengaged " ; and (3) The needle vertical or vibrating, which indicates that the renter is " calling" The connections of the telephone by means of which these signals are automatically sent from the renter's office are given in fig.
What to read after A Manual of Telephony?
You can find similar books in the "Read Also" column, or choose other free books by William Henry Preece to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
As indicated by fig. 221, the instrument or operator's peg is composed of four sections two top and two bottom which are joined across in pairs by the double flat springs recessed in L x and L a . A four-conductor cord is used with this peg.
The indicators used for this system are really small non-polarised relays, with long iron-cased coils wound to i, ooo w resistance. In addition to the local INDICA TOR.
287 circuit arrangement, however, there is a conspicuous white needle, which is polarise...d by being pivotted in the forked end of a permanent magnet. This needle, which is actuated by the coils, constitutes the sole indicator for normal use as a means of calling and of indicating the state of a circuit. Shutters are entirely dispensed with, so saving the clerk's labour and time in restoring them after every call. Three positions of the indicator needle are utilised for indicating distinctive signals namely : Fig. 222. Connections of Renter's Telephone.
(1) Deflection to the left, which signifies "engaged" ; (2) Deflection to the right, which is the normal position, and signifies " disengaged " ; and (3) The needle vertical or vibrating, which indicates that the renter is " calling" The connections of the telephone by means of which these signals are automatically sent from the renter's office are given in fig.
What to read after A Manual of Telephony?
You can find similar books in the "Read Also" column, or choose other free books by William Henry Preece to read onlineMoreLess
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