Some three years ago the French "Government appointed Technical Commission to investigate and study all ay able automatic sys- i toms. This Conhission called upon all telephone manufacturers to submit plans and demonstrate the suitability of their respective sys-toms for the large Paris area. After an exhaustive study extend ing over two years, the Rotary system was unanimously adopted Thecause of its manifest superiority over all competing systems. Forty thousand lines of Rotary equipment are being installed at Paris in this year, A copy of the report of this French Technical Commission is available at Shanghai for ready reference at the offices of the suppliers of the Shanghi Rotary automatic equipment, 'A similar Technical Commissi in Belgium has recently decided to use Rotary equipment exclusively throughout the entire nation. That these are not isolated decisions is shown by the fact that over 1,200,000 lines of Rotary are installed or on order.
The Rotary system gives a quality of service which can never be equalled by the Step-by-Step System due to a feature of the Rotary system through which when all function channels are busy, a call is merely slightly delayed, not lost the Step-by-Step system. This is conclusively proven by statistics of the Swiss Telephone Administration. Theft records show that the total machine faults in the Rotary equipment at Zurich are less than three tenths of one percent, whereas for the Step-by-Step office at Berne, lost calls alone average one per cent. It is on these technical grounds and service records that telephone engineers over the entire world are so generally giving preference to the power driven non-decimal system.
National Manufacture in London For London, the British Government demanded that its automatic system be manufactured in that country and inasmuch as there were at that time, two large companies manufacturing Step-by-Step equipment in Great Britain and as British Post Office Engineers found it possible to incorporate in the Strowger system, the fundamental ture of the Rotary system referred to) these conditions determined the choice of system for London, National manufacture was the governing factor. The decision to instal Step-by-Step equipment in Japan was due in large part to the Government's desire to adopt a system which is built by several manufacturers. No thorough study of alternative systems was made.
In the United States, the Bell System has decided that although]
Step-by-Btep system is satisfactory for installation in smaller it is not suitable for large metropolitan areas. As the manu. facturing subsidiary of the Bell System, the Western Electric Company is therefore required to manufacture panel equipment for portant networks and Step-by-Step equipment for other localities.
bby-Step is used merely because first cost is less than for panel. Finally, International Telephone and Telegraph Corporation in the a, factories of its various subsidiary companies, manufacture both Step-by-Step and power driven systems, Dut it is significant to note that when new installations are made by any of its associated operating, telephone companies, Rotary equip: ment is invariably equipment as in everything else, and it has it in the Rotary automatic system.
Text read from the printed page and cleaned; old type leaves the occasional error.