CREATE TABLE "table1_1847180_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);

Question: Which district did Ralph Harvey (r) vacated when he resigned?
SQL: SELECT "district" FROM "table1_1847180_4" WHERE "vacator"='Ralph Harvey (R)';

Question: Who did Walter B. Jones, Sr. (d) succeeded in office?
SQL: SELECT "vacator" FROM "table1_1847180_4" WHERE "successor"='Walter B. Jones, Sr. (D)';