HARRIMAN TO JOIN RUSK IN DETAILING PACT TO CONGRESS; Test Ban Negotiator Will Brief Senators--House Unit to Hear Secretary RATIFICATION DRIVE ON Moves Are Part of Effort by Administration to Win Vote by Wide Margin Committee Hearings Soon President Gets Reports HARRIMAN TO JOIN RUSK AT BRIEFING Clarification Expected Prospects for Ratification Scott Urges Caution
WASHINGTON, July 28-- Secretary of State Dean Rusk and Under Secretary W. Averell Harriman will appear before Congressional committees tomorrow to explain the treaty for a partial nuclear test ban. The United States expects to sign the treaty with Britain and the Soviet Union later this week.