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Your home for vintage electromechanical telephone systems
all electromagnetic telephone systems, J A Fleming "“Truly, the automatic telephone system seems the very high-water mark of human creative power.‘’
contents of calling315.com

   Why Calling315.com? 

telephone exchange demos

“Want to learn about electro-mechanical telephone systems? Go no further than Calling315.com. With more than 70 articles, you will get a landscape view of this vintage age spanning ~80 years.”

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— Brian Cameron

Telephone Exchange Technician for 38 years, Christchurch, New Zealand

"This website is an amazing resource for understanding telephone switching technologies from the 1890s to 1970s. Ever since I was a kid, I've found this to be a fascinating topic in electromechanical engineering. This site clearly reflects a real passion for it."​

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—Bryce Schroeder, MD, PhD (Bio. Eng.) 

“Hear and see vintage relays in action! Explore the brilliant old phone system and its many marvelous parts! Nothing lays out telephone history with all its wonderful details as well as Calling315.com. As a writer researching 1950s relays, I couldn't believe my good fortune when I found it.”

 

—Priscilla Gilman, author 

telephjone transmission, toll networks, inventors and innovators of early telephone systems AG Bell, AB Strowger, EB Craft and E Molina

Visit the Hierarchical Table of Contents or the Table of Contents to get a high level overview of all the articles on this site.  

Vintage electromechanical telephone exchanges, interactive demos, Crossbar, Panel, Step, Strowger, 7A Rotary, Ericsson XY, Ericsson 500, Western Electric, annunciators, switchboards, Pentaconta, Bell, Watson, Lorimar, Keith, Ericsson, toll, transmission, impairments, inventors, anatomy of an exchange, power rooms, sequence switches, ringing and tone generators, 15 talking path switches, and trunking explained. This is a Tribute to telephones, exchange switching and relays in service from 1875 to 1965. 

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