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Announcements

January Singing Wires is now available in the members login area.

Telephone Collectors International is an organization of telephone collectors, hobbyists and historians who are helping to preserve the history of the telecommunications industry through the collection of telephones and telephone related material. Our collections represent all aspects of the industry; from the very first wooden prototypes that started the industry to the technological marvels that made the automatic telephone exchange possible.

If any of this interests you, we invite you to join our organization. Look around and see what we have to offer. Thanks for stopping by!

Telephone Collectors International
3805 Spurr Circle
Brea, CA 92823
714-528-3561

Sample from the January 2015 Singing Wires
The Transcontinental Telephone Line
by Tyler E. Bagwell

The transcontinental telephone line, stretching between New York City and San Francisco, crossed through 13 states. Four copper wires, the means to transmit the telephone signal, were held up by 130,000 wood poles. On the day of the historic phone call, approximately 1,500 AT&T employees were positioned across the entire length of the line, east to west, and on the line between Jekyll Island and New York City. The workers were prepared to fix or repair any problem that might impede the ceremonial phone call.

The 1915 opening ceremony consisted of a four-way call between......

For the rest of this story along with many others, access to our Bonus Pages which contain many more photos, online access to all back issues of Singing Wires from 1986 on and many other benefits, join our club. It's easy and it's not expensive.

Sample from the January 2015 Switchers' Quarterly
The 1A ESS Central Pulse Distributor
By Chris Mattingly

The CPD provides strobe, or 'enable' signals needed for any peripheral equipment in the office. Mostly this is for the peripheral switch frames, scanners and signal distributors (circuits that operate and release relays in trunks), to trigger them into taking an order off the communications bus and executing it. It also supplies pulses to set and reset flip-flop circuits in other peripherals, such as intelligent controllers and trunk circuits that use high speed mercury relays. The CPD is near the heart of the office and is an essential piece of equipment.

The peripheral bus that comes from the 1A Central Control does not have the.....

Our Journal for those interested in telephone switching systems, both old and modern. For the rest of this story and online access to all back issues, join our club and add the Switchers' Quarterly option for $5 a year more.

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