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with Dow Corning Silicone Defoamers* There's α right tool for every job. In foam control it's Dow Corning silicone anti- foamers or defoamers . . . job-proved thousands of times over as the most efficient, most economical, and most versa- tile foam suppressors available. At prescribed levels, are sanctioned by FDA FREE SAMPLE and new manual on foam control Dow Corning CORPORATION MIDLAND. MICHIGAN Dept. 1911b Please rush a FREE SAMPLE of a Dow Corning silicone defoamer for my product or process, which is (indicate if food, aqueous, oil or other): POSITION COMPANY Bell Telephone Tests New Phone System Bell Telephone Laboratories and Illi- nois Bell Telephone have started a cus- tomer try-out of an electronic central telephone office at Morris, 111. Bell says it is the first telephone system which performs all the functions of handling telephone calls electronically. Using 23,000 tiny neon-filled tubes in the switching network along with J 2,000 transistors, 105,000 diodes, and tens of thousands of other electronic components, the system will allow the people in Morris to: • Use home extension phones as intercoms, by dialing two digits. • Reach frequently called numbers by dialing only two digits. • Dial a code which causes all sub- sequent incoming calls to be auto- matically transferred to any other number (for example, to a friend's home, if you will spend the evening there). • Have incoming calls routed to an- other phone when the originally called line is busy. After the trial has been under way for awhile, Bell expects to introduce other services, such as allowing a third party to be called into an existing telephone conversation and making an immediate connection to a busy line as soon as the line becomes available. The new system has a memory of instructions—about 2 , /' l million bits of information—stored on photographic plates. This memory tells the machine what to do in any situation it might encounter. This differs from the old system which does not have a memory but follows a fixed routine in handling incoming calls. The whole system works with such speed that in its spare time the system can check its own circuits for any failures. Once these are spotted the system can usually fix the failure itself and, if not, it types out a detailed re- port of the failure to be passed on to a repairman. Some of the basic theory of this sys- tem has been known for years, but the system was not feasible till the inven- tion of transistors and other semicon- ductor devices. Also, a high-speed high-capacity memory system was necessary for the system to work properly. Although the Morris installation is only an experimental model, Bell en- gineers are already working on a pro- duction model which they expect to have in operation by mid-1965. From then on the electronic system will be used in all new offices and to replace worn out central offices, Bell says. Neon-filled tubes replace electro-me- chanical relays in Bell's new electronic telephone system. The tubes glow a bright red as they connect one telephone with another COMING NEXT WEEK Synthetic Fibers in Europe Europe's synthetic fiber industry is growing impressively, with sales stimulated by increased demand for everything from lighter weight clothing to more durable fish nets. A C&EN Special Report 104 C&EN NOV. 2 8, 196 0 Bear Down on FOAM
Transcript of News-scripts
with Dow Corning Silicone Defoamers*
There's α right tool for every job. In foam control it's Dow Corning silicone anti-foamers or defoamers . . . job-proved thousands of times over as the most efficient, most economical, and most versa-tile foam suppressors available.
At prescribed levels, are sanctioned by FDA
FREE SAMPLE and new manual on foam control
D o w C o r n i n g C O R P O R A T I O N
M I D L A N D . M I C H I G A N
Dept. 1911b
Please rush a FREE SAMPLE of a Dow Corning silicone defoamer for my product or process, which is (indicate if food, aqueous, oil or other):
POSITION
COMPANY
Bell Telephone Tests New Phone System Bell Telephone Laboratories and Illinois Bell Telephone have started a customer try-out of an electronic central telephone office at Morris, 111. Bell says it is the first telephone system which performs all the functions of handling telephone calls electronically.
Using 23,000 tiny neon-filled tubes in the switching network along with J 2,000 transistors, 105,000 diodes, and tens of thousands of other electronic components, the system will allow the people in Morris to:
• Use home extension phones as intercoms, by dialing two digits.
• Reach frequently called numbers by dialing only two digits.
• Dial a code which causes all subsequent incoming calls to be automatically transferred to any other number (for example, to a friend's home, if you will spend the evening there).
• Have incoming calls routed to another phone when the originally called line is busy.
After the trial has been under way for awhile, Bell expects to introduce other services, such as allowing a third party to be called into an existing telephone conversation and making an immediate connection to a busy line as soon as the line becomes available.
The new system has a memory of instructions—about 2 , / ' l million bits of information—stored on photographic plates. This memory tells the machine what to do in any situation it might encounter. This differs from the old system which does not have a memory but follows a fixed routine in handling incoming calls.
The whole system works with such speed that in its spare time the system can check its own circuits for any failures. Once these are spotted the system can usually fix the failure itself and, if not, it types out a detailed report of the failure to be passed on to a repairman.
Some of the basic theory of this system has been known for years, but the system was not feasible till the invention of transistors and other semiconductor devices. Also, a high-speed high-capacity memory system was necessary for the system to work properly.
Although the Morris installation is only an experimental model, Bell engineers are already working on a production model which they expect to have in operation by mid-1965. From then on the electronic system will be used in all new offices and to replace worn out central offices, Bell says.
Neon-filled tubes replace electro-mechanical relays in Bell's new electronic telephone system. The tubes glow a bright red as they connect one telephone with another
C O M I N G N E X T W E E K
Synthetic Fibers in Europe Europe's synthetic fiber industry is growing impressively, with sales stimulated by increased demand for everything from lighter weight clothing to more durable fish nets. A C&EN Special Report
104 C & E N NOV. 2 8, 196 0
Bear Down on FOAM
