NDLI: Some phases of railroad telegraph and telephone engineering

Content Provider	IEEE Xplore Digital Library
Author	Rhoads, Stanley
Copyright Year	1920
Abstract	Statement of size of N. Y. C. Lines telegraph and telephone plant and variety of engineering problems involved. Telephones used almost exclusively for train dispatching, not so general for message work, but growing. Automatic telephones used. Extensive local and long distance lines and switchboards. Telegraph system reaches all stations. Pole line is basis of plant, increasing in strength to meet safely the loads to which subjected. Railroad employs wire chiefs. Problems include electric protection, inductive interference, electrolysis, transmission, traffic, necessitating continual experiment and investigation. Telegraph answer-back used with selectors. Phantom telephone circuits used. Single wires for railroad telegraph obsolete, all wires used in simultaneous telegraphy and telephony. Extra high impedance telephones used for train dispatching. Iron wire joints welded. Battery consumption data; unit type switchboards designed, supplant dry battery for main selector ringing battery; chemical rectifier also used. Oscillograms of single-line telegraph current waves, when line insulation varies. Railroad long-distance lines can be loaded. Telephone selector current waves given. Gill local bell selectors used with repeat coil signaling to obtain low-resistance simplex. Duplex telegraph used on about 10,000 miles of circuit on N. Y. C. Lines. Polar duplex is approximate three-wire circuit. Self-balancing duplex designed, especially adaptable at unattended repeater stations; oscillograms illustrating results in better balance of duplexes. No. 5-U retard coil of standard bridging duplexes and quads is auto-transformer as well as retard coil; is useful as retard, detrimental otherwise. Polar relay armature of differential duplex and quadruplex has more force than in bridging. Differentially connected relays are transformers to some degree. Inductive effects of differential sets. Standard quadruplex, common side, is too sluggish for hand-operated sending machines. Defects of quadruplex discussed. Limiting practicable lengths stated for various kinds of wire for telegraph and telephone circuits.
Starting Page	224
Ending Page	232
Page Count	9
File Size	3055985
File Format	PDF
ISSN	03606449
Volume Number	40
Issue Number	3
Language	English
Publisher	American Institute of Electrical Engineers
Publisher Date	1921-01-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wires Relays Dispatching Cities and towns Companies Switches Repeaters
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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