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Telephone Service for the Pentagon Building (Bell Laboratories Record, Vol. XXVIII, No. 8).--What will be the world's largest private branch system is coming into being in Washington for the Department of Defense. A stepby-step system, it was manufactured by Western Electric and furnished to the Government by the Chesapeake and Potomac Telephone Company. It will have 18,500 lines and 33,000 telephones and will handle upwards of 250,000 calls a day. By calling Liberty 5-6700, any telephone in the Pentagon can be reached; and by October when Navy telephones are transferred, the same number will reach them.
Large enough to serve a city of 200,000 people, the new system could be nearly doubled in size in an emergency. Incoming calls to the Defense Department will be handled at the Pentagon switchboard being used eight hours per day and five days each week.
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A device so sensitive that it will indicate the differences in thickness of a fingerprint on a piece of smooth glass, has been developed by J. A. SAMS of the G.E. Works Laboratory at Schenectady. Known as a surface indicator, the instrument is used to determine the smoothness of metal or painted sur
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