File:The practical telephone handbook and guide to the telephonic exchange (1906) (14775973713).jpg

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English:

Identifier: practicaltelepho00pool (find matches)
Title: The practical telephone handbook and guide to the telephonic exchange
Year: 1906 (1900s)
Authors: Poole, Joseph
Subjects: Telephone
Publisher: New York, Macmillan Co.
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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Text Appearing Before Image:
ical instrument soundedinto the mouthpiece t should cause interruptions in thecurrent in unison with the vibrations of the sound produced.To accomplish this a large circular opening on the top of thebox k is closed in with a stretched membrane, m. On theupper surface of this is a strip of platinum, o i, connected 48 HISTORY 49 to the terminal 2. On the part o of this in the centre of themembrane, one corner of a platinum point attached at b toan angle-shaped metal piece, a b c, just touches it undernormal conditions.If the contact oforms part of acircuit which in-cludes a batteryand the receiver,Fig. 31, and themembrane be setin vibration by amusical sound, thecircuit will be interrupted at every vibration. Each inter-ruption produces a sound in the receiver, and a musical soundsimilar in pitch to the one sounded in the mouthpiece of thetransmitter will be given out by the receiver, no matter howdistant it may be. The apparatus shown on the sides of the instruments are battery_&£
Text Appearing After Image:
Fig. 31 keys for signalling pur-poses. By such means the pitchof any sound may be re-produced at a distance;but this was not enoughfor the transmission ofspeech. Pitch is only oneof the characteristics ofsound, for besides it, soundhas quality or timbre, anddegrees of loudness ox in-tensity, which it was neces-sary to transmit before human speech could be perfectlytransmitted. This cannot be done by an apparatus whichemploys interrupted, currents for its working. Sound is conveyed through air by a wave motion. Thewave motion of water is caused by an up-and-down motion D

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Flickr tags
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  • bookid:practicaltelepho00pool
  • bookyear:1906
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Poole__Joseph
  • booksubject:Telephone
  • bookpublisher:New_York__Macmillan_Co_
  • bookcontributor:Northeastern_University__Snell_Library
  • booksponsor:Boston_Library_Consortium_Member_Libraries
  • bookleafnumber:72
  • bookcollection:northeastern
  • bookcollection:blc
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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