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THE RE she sir's with' ber needlework, ini h e. favorite easy chair-a picrure *of quiet comfort. Or she may be playing bridge wirh ber friends. She may be aroused in the middie of the nighc by a tiny grandchild's cry. She may be making toast for break- switch in her home is a vasr and complicared sysrem of service. Tons of crushed coal are fed ino furnaces to keep boilers sreaming. Machinery is humming. Men are constantly on warch. Out along te lunes more mien are -on dury te keep miles cf copper wire, burieci a