Tag "Bell Telphone"
The Transistor that smashed a frequency barrier (Feb, 1956)

The Transistor that smashed a frequency barrier

A new transistor invented at Bell Telephone Laboratories can provide broadband, high-frequency amplification never before possible with transistors. The big leap in frequency is made possible by a diffusion process that earlier enabled Laboratories scientists to create the Bell Solar Battery.


Bah, Cisco shmisco. I’ll bet you they don’t have hole-punch based routing tables!


To find out how to route Long Distance calls a dial system needs lots of information—fast. To provide it Bell Laboratories engineers developed a new kind of card file—one that dial systems can read.



In the eye of a needle above is a transistor switch that can turn on or off in ten billionths of a second. It is an example of the micro-miniature devices that Western Electric makes today for the new Electronic Switching Systems now being put into service in the Bell telephone network. Life-size, the unit shown is scarcely larger than the period that ends this sentence.

Where voices are powered by the sun (Jan, 1956)

Where voices are powered by the sun

A new kind of telephone system developed by Bell Telephone Laboratories for rural areas is being operated experimentally by electric current derived from sunlight. Electric current is generated as sunlight falls on the Bell Solar Battery, which a lineman is seen adjusting in position.

Sixty billion vibrations per second (May, 1956)

Sixty billion vibrations per second

A great new giant of communications—a waveguide system for carrying hundreds of thousands of voices at once, as well as television programs —is being investigated at Bell Telephone Laboratories.

Such a revolutionary system calls for frequencies much higher than any now used in communications. These are provided by a reflex klystron tube that oscillates at 60,000 megacycles, and produces waves only 5 mm. long.

We dug and refilled a 4000-mile trench to protect 9300 communications circuits against disaster (Apr, 1965)

We dug and refilled a 4000-mile trench to protect 9300 communications circuits against disaster

We split the continent with a trench four feet deep to give the United States its first blast-resistant coast-to-coast underground communications cable system.

More than four years ago when the first of 2500 giant reels of coaxial cable, started unrolling in New York State, we began an important project that will give added protection to the nation’s vital communications.

New Bell Solar Battery Converts Sun’s Rays Into Electricity (Sep, 1954)

New Bell Solar Battery Converts Sun’s Rays Into Electricity

Bell Telephone Laboratories demonstrate new device for using power from the sun.

Great and kindly is the sun. Each day it bathes the earth in light, bringing life to everything on earth.

Scientists have long reached for the secret of the sun. For they have known that it sends us nearly as much energy daily as is contained in all known reserves of coal, oil and uranium.

One finger works all this (Jan, 1950)

One finger works all this

TWIRL your Bell telephone dial and a maze of apparatus like this goes into action in the central office—puts your call through quickly, surely.

Making and installing such complex apparatus— as well as producing telephones, cables and thousands of other kinds of equipment used in your service—is Western Electric’s job as manufacturing unit of the Bell System.

What the Telephone Map Shows (Sep, 1914)

What the Telephone Map Shows

EVERY dot on the map marks a town where there is a telephone exchange, the same sized dot being used for a large city as for a small village. Some of these exchanges are owned by the Associated Bell companies and some by independent companies. Where joined together in one system they meet the needs of each community and, with their suburban lines, reach 70,000 places and over 8,000,000 subscribers.

The pyramids show that only a minority of the exchanges are Bell-owned, and that the greater majority of the exchanges are owned by independent companies and connected with the Bell System.

At comparatively few points are there two telephone companies, and there are comparatively few exchanges, chiefly rural, which do not have outside connections.

The recent agreement between the Attorney General of the United States and the Bell System will facilitate connections between all telephone subscribers regardless of who owns the exchanges.

Over 8,000 different telephone companies have already connected their exchanges to provide universal service for the whole country.

American Telephone and Telegraph Company And Associated Companies
One Policy One System Universal Service

Bell System Data-Phone (Apr, 1965)

Few things are as useless to a businessman as information that reaches him too late

When vital business information is tardy, something or someone usually suffers. Production is slowed up. A customer has to wait. A decision is delayed.

Remedy: Bell System Data-Phone* service. Connected with the business machine-virtually any type —it converts data (from punched cards or tapes) into a special “tone” language and transmits it over the same nationwide telephone network you use for voice communications.