元のファイル ‎(2,816 × 1,910 ピクセル、ファイルサイズ: 504キロバイト、MIME タイプ: image/jpeg)

このファイルは、ウィキメディア・コモンズから呼び出されています。

このファイルは、他のプロジェクトで使用されている可能性があります。

このファイルの解説やノートへの記入、履歴などの詳細の確認は、ウィキメディア・コモンズのファイルページ（ノート/履歴/ログ）を使用してください。
ウィキメディア・コモンズのファイルページにある説明を、以下に表示します。

概要

解説Bell telephone magazine (1922) (14569847558).jpgEnglish:

Identifier: belltelephonemag09amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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:
fall back, and then closed the circuit through heavycalling battery B-l, operating tap bell R-D. The operatorthen shifted plug P-d from the right-hand to the left-hand hole,disconnecting subscriber Z)s central office burglar alarm circuitand connecting the operators telephone, T, to subscriber Z)sline. When his bell rang, subscriber D moved his substationswitch from the right-hand to the left-hand contact, thus dis-connecting his substation burglar alarm circuit from his lineand connecting in his telephone, T-D. The operator, after notifying subscriber D that subscriber Bwished to talk with him, removed plug P-d from the left-handhole, moved switch 5 to its right-hand contact, and insertedplug Q, at the end of cord C, in hole H-d. This placed thetelephones of subscriber B, the operator and subscriber D all inone circuit (Fig. 4). The operator could thus determine, bylistening in, when the conversation was finished. When thisoccurred, the operator withdrew plug Q from hole H-d, re- 209
Text Appearing After Image:
210 THE FIRST TELEPHONE SWITCHBOARD placed plugs P-b and P-d in the right-hand holes of the centraloffice plug and block switches, and moved switch 5 to its left-hand contact. When subscribers B and D had moved theirsubstation switches to the right-hand contacts, the operatorrestored the shutters of annunciators A-b and A-d (the latterhaving fallen when its galvanometer circuit was opened), andclosed switch W. The apparatus at the central office and sub-stations was then in readiness for another call to be made. G. K. Thompson,R. B. Hill. Note: The authors wish to express their indebtedness to Mr.W. L. Richards, Consulting Historian of the Bell TelephoneLaboratories, for his assistance in the preparation of this arti-cle. 211 Worlds Telephone Statistics January 1, 1929 ACCORDING to the latest annual survey of the worldstelephones which was recently completed by the ChiefStatisticians Division of the American Telephone and Tele-graph Company, there were 32,712,284 telephones in the wor

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.
日付1922年
原典

https://www.flickr.com/photos/internetarchivebookimages/14569847558/

Source book page: https://archive.org/stream/belltelephonemag09amerrich/belltelephonemag09amerrich#page/n213/mode/1up

作者Internet Archive Book Images
許可
(ファイルの再利用)At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
VolumeInfoField9
Flickr tagsInfoField.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li,.mw-parser-output .hlist .mw-empty-elt{display:none}.mw-parser-output .hlist dt:after{content:": "}.mw-parser-output .hlist dd:after,.mw-parser-output .hlist li:after{content:" ・ ";font-weight:bold}.mw-parser-output .hlist dd:last-child:after,.mw-parser-output .hlist dt:last-child:after,.mw-parser-output .hlist li:last-child:after{content:none}.mw-parser-output .hlist dd dd:first-child:before,.mw-parser-output .hlist dd dt:first-child:before,.mw-parser-output .hlist dd li:first-child:before,.mw-parser-output .hlist dt dd:first-child:before,.mw-parser-output .hlist dt dt:first-child:before,.mw-parser-output .hlist dt li:first-child:before,.mw-parser-output .hlist li dd:first-child:before,.mw-parser-output .hlist li dt:first-child:before,.mw-parser-output .hlist li li:first-child:before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child:after,.mw-parser-output .hlist dd dt:last-child:after,.mw-parser-output .hlist dd li:last-child:after,.mw-parser-output .hlist dt dd:last-child:after,.mw-parser-output .hlist dt dt:last-child:after,.mw-parser-output .hlist dt li:last-child:after,.mw-parser-output .hlist li dd:last-child:after,.mw-parser-output .hlist li dt:last-child:after,.mw-parser-output .hlist li li:last-child:after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li:before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child:before,.mw-parser-output .hlist dt ol>li:first-child:before,.mw-parser-output .hlist li ol>li:first-child:before{content:" ("counter(listitem)"\a0 "}

bookid:belltelephonemag09amerrich

bookyear:1922

bookdecade:1920

bookcentury:1900

bookauthor:American_Telephone_and_Telegraph_Company

bookauthor:American_Telephone_and_Telegraph_Company__Information_Dept

booksubject:Telephone

bookpublisher:_New_York__American_Telephone_and_Telegraph_Co___etc__

bookcontributor:Prelinger_Library

booksponsor:Internet_Archive

bookleafnumber:213

bookcollection:prelinger_library

bookcollection:additional_collections

bookcollection:americana

Flickr posted dateInfoField2014年7月27日

ライセンス

この画像はFlickrのThe Commonsから提供されています。Flickrにアップロードした組織は次のような理由などから「著作権上の制限無し」と分類することがあります。

著作権の保護期間が満了しているため、パブリックドメインの状態に置かれている。

（著作権保護を得るための著作権表示が）必要な形式や条件に沿うことができていないなど、1. 以外の理由でパブリックドメインに置かれている。

アップロードした組織が著作権を保持するが、著作権の行使に興味が無い。

アップロードした組織が、制限無しに著作物を利用することを他者に許可するのに十分な法的権利を有する。