CREATE TABLE table_2417345_3 (successor VARCHAR2, date_of_successors_formal_installation VARCHAR2)

Who was the successor that was formally installed on March 30, 1870?
SELECT successor FROM table_2417345_3 WHERE date_of_successors_formal_installation = "March 30, 1870"
SELECT "successor" FROM "table_2417345_3" WHERE "March 30, 1870" = "date_of_successors_formal_installation"