Representatives of Boston newspapers and wire services were guests of the University yesterday afternoon on a tour designed to point out Harvard's contribution to the war effort. Beginning their inspection with a press luncheon at the Faculty Club, presided over by Dean Paul H. Buck and addressed by army and Navy representatives who spoke to them both on and off the record, the newsmen spent on hour in Cambridge. At 3:30 o'clock they crossed the Charles to visit the Business School. After examining the Fatigue Laboratory, they were addressed by Dean Donald K. David and taken to a cocktail party.