Wikimedia Commons

File:The practical telephone handbook and guide to the telephonic exchange (1906) (14753750674).jpg

Original file ‎(1,772 × 620 pixels, file size: 107 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

edit
The categories of this image need checking. You can do so here.
  • Please remove redundant categories and try to put this image in the most specific category/categories.
  • You can remove this template by clicking here (or on the first line).



Description
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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
'
 Text Appearing After Image:
:V777ZZ&2Z^ Fig. 37 On the same day that Bell filed his patent, Prof. E. Gray 54 PRACTICAL TELEPHONE HANDBOOK also filed one with very similar suggestions for producing varia-tions in the resistance of an electric circuit. Edisons Carbon Transmitter.—Edison, in 1878, was the firstto produce a successful instrument based on the variation ofresistance principle. He took advantage of the fact discoveredby Du Moncel, that the increase of pressure between twoconductors in contact produces a diminution in their electricalresistance. This is eminently the case with carbon, whichwas the substance chosen by Edison, its great variation ofresistance under pressure having been independently dis-covered by him. The instrumentEdison finallyadopted after manyforms had been ex-perimented with,was that known asthe button trans-mitter, shown inFig. 38. d is a micadiaphragm clampedto the iron case bythe iron cap, in which is screwed the ebonite mouthpiece e.Pressing against <,the centre of d is

Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
Date
Source

https://www.flickr.com/photos/internetarchivebookimages/14753750674/

Author Internet Archive Book Images
Permission
(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Flickr tags
InfoField
  • 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:76
  • bookcollection:northeastern
  • bookcollection:blc
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

Licensing

edit
This image was taken from Flickr's The Commons. The uploading organization may have various reasons for determining that no known copyright restrictions exist, such as:
  1. The copyright is in the public domain because it has expired;
  2. The copyright was injected into the public domain for other reasons, such as failure to adhere to required formalities or conditions;
  3. The institution owns the copyright but is not interested in exercising control; or
  4. The institution has legal rights sufficient to authorize others to use the work without restrictions.

More information can be found at https://flickr.com/commons/usage/.

Please add additional copyright tags to this image if more specific information about copyright status can be determined. See Commons:Licensing for more information.
This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14753750674. It was reviewed on 18 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

18 September 2015

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current06:35, 18 September 2015Thumbnail for version as of 06:35, 18 September 20151,772 × 620 (107 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': practicaltelepho00pool ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fpracticalteleph...

You cannot overwrite this file.

There are no pages that use this file.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:The_practical_telephone_handbook_and_guide_to_the_telephonic_exchange_(1906)_(14753750674).jpg&oldid=654537947"