Cyclopedia of Telephony and Telegraphy, Vol. 1 / A General Reference Work on Telephony, etc. etc.

by American School of Correspondence

[THE OPERATING ROOM OF THE EXCHANGE AT WEBB CITY, MISSOURI]

[A TYPICAL MEDIUM-SIZED MULTIPLE SWITCHBOARD EQUIPMENT]

[MAIN OFFICE, KEYSTONE TELEPHONE COMPANY, PHILADELPHIA, PA.]

[MAIN OFFICE, KANSAS CITY HOME TELEPHONE CO., KANSAS CITY, MO.]

[VENTILATING PLANT FOR LARGE TELEPHONE OFFICE BUILDING]

[ONE WING OF OPERATING ROOM, BERLIN, GERMANY
Ultimate Capacity 24,000 Subscribers' Lines and 2,100 Trunk Lines. Siemens-Halske Equipment. Note Horizontal Disposal of Multiple]

[OPERATING ROOM AT TOKYO, JAPAN]

[ONE WING OF OPERATING ROOM, BERLIN, GERMANY
Ultimate Capacity 24,000 Subscribers' Lines and 2,100 Trunk Lines. Siemens-Halske Equipment. Note Horizontal Disposal of Multiple Jack Field.]

[VIEW OF A LARGE FOREIGN MULTIPLE SWITCHBOARD]

[OLD SWITCHBOARD OF BELL EXCHANGE SERVING CHINATOWN, SAN FRANCISCO, CALIFORNIA]