Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives Magazine Sponsor RF Cafe Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Alliance Test Equipment Centric RF Empower RF ISOTEC Reactel RF Connector Technology San Francisco Circuits Anritsu Amplifier Solutions Anatech Electronics Axiom Test Equipment Conduct RF Copper Mountain Technologies Exodus Advanced Communications Innovative Power Products KR Filters LadyBug Technologies Rigol TotalTemp Technologies Werbel Microwave Windfreak Technologies Wireless Telecom Group Withwave RF Cafe Software Resources Vintage Magazines RF Cafe Software WhoIs entry for RF Cafe.com Thank you for visiting RF Cafe!
Exodus Advanced Communications Best in Class RF Amplifier SSPAs

Copper Mountain Technologies (VNA) - RF Cafe

LadyBug RF Power Sensors

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads

These Are Available for Free

Espresso Engineering Workbook™

Smith Chart™ for Excel

Exodus Advanced Communications Best in Class RF Amplifier SSPAs - RF Cafe

Bell Telephone Laboratories: Quality Control
November 1947 Popular Science

November 1947 Popular Science

November 1947 Popular Science Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Popular Science, published 1872-2021. All copyrights hereby acknowledged.

Bell Telephone Laboratories (Bell Labs) is a prime example of how a company builds a reputation as a provider of excellent products and services. Engineers, technicians, and managers designed and built a telephony system that was the envy of the world. It did so through extensive testing of designs and stringent quality control during manufacturing. The nationwide network build-out was equally robust and reliable. Constant maintenance and improvement methods developed by Bell Labs assured customers that service would be available whenever needed. Internal research in both the electronic and the mechanical arenas played a large part in their success. Being able to withstand the rigors of environmental factors (heat, cold, vibration, dirt, water, etc.) was the result of a major investment in science and engineering. Unfortunately, success went to their metaphorical corporate head and monopolistic practices caused the federal court to order a breakup of the leviathan company into small parts that needed to compete with other innovators. I'm still dubious about the decision, since Bell Telephone deserved some protection against infringement on its accomplishments. Acquiring land and building out a massive wired network could have been done concurrently with Bell's efforts, but was not. Blame for the outcome is shared by Bell and its challengers.

Bell Telephone Laboratories Ad

Bell Telephone Laboratories, November 1947 Popular Science - RF CafeYour Telephone Transmitter and Receiver, voice gateways to the telephone plant, are so essential to satisfactory service that they have been under study in Bell laboratories for seven decades.

A telephone receiver is a complex system of electrical and mechanical elements. Its coils, magnets, diaphragm and cap react on each other as they convert the electrical waves of your voice to sound waves. What is the best size for the holes in the ear cap? Will 1/1000th inch greater thickness help a receiver diaphragm to carry your telephone voice more clearly? One way to find out is to build numerous experimental receivers and test them.

But Bell Telephone Laboratories have found a shorter way. They built an all-electrical replica, an "equivalent circuit" in which electrical resistance stands for air friction in the cap holes; capacitance corresponds inversely to the stiffness of the diaphragm. Over-all performance of this circuit can be quickly measured and design changes economically explored. Later, a model can be built for final check.

The "equivalent circuit" was pioneered by Bell Telephone Laboratories 25 years ago. It is a useful tool in many Laboratories developments - saving time, saving the cost of machine-tooled models, encouraging experimentation. It is one more example of the way Bell scientists get down to fundamentals as telephone progress continues-and service keeps on improving for all subscribers.

Bell Telephone Laboratories

Exploring and Inventing, Devising and Perfecting, for Continued Improvements and Economies in Telephone Service

 

 

Posted May 6, 2024

Bell Telephone Laboratories Infomercials
PCB Directory (Manufacturers)

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website: AirplanesAndRockets.com

My Daughter's Website: EquineKingdom

Crane Aerospace Electronics Microwave Solutions: Space Qualified Passive Products

Windfreak Technologies Frequency Synthesizers - RF Cafe

Anatech Electronics RF Microwave Filters - RF Cafe