| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | 76th United States Congress - Senate |  |  |  |  |
| 3 | State (class) | Vacator | Reason for change | Successor | Date of successor's formal installation |
| 4 | Illinois (2) | J. Hamilton Lewis (D) | Died April 9, 1939. Successor appointed April 14, 1939, to continue the term. | James M. Slattery (D) | April 14, 1939 |
| 5 | Kentucky (2) | M. M. Logan (D) | Died October 3, 1939. Successor appointed October 10, 1939, to continue the term. | Happy Chandler (D) | October 10, 1939 |
| 6 | Idaho (2) | William E. Borah (R) | Died January 19, 1940. Successor appointed January 27, 1940, to continue the term. | John W. Thomas (R) | January 27, 1940 |
| 7 | Vermont (3) | Ernest W. Gibson (R) | Died June 20, 1940. Successor appointed October 14, 1940, to continue the term. | Ernest W. Gibson, Jr. (R) | October 14, 1940 |
| 8 | Minnesota (2) | Ernest Lundeen (FL) | Died August 31, 1940. Successor appointed October 14, 1940, to continue the term. Successor lost election to finish the term. | Joseph H. Ball (R) | October 14, 1940 |
| 9 | Nevada (1) | Key Pittman (D) | Died November 10, 1940. Successor appointed November 27, 1940, to continue the term. Successor lost nomination to finish the term. | Berkeley L. Bunker (D) | November 27, 1940 |
| 10 | Illinois (2) | James M. Slattery (D) | Interim appointee lost election November 21, 1940, to finish the term. | Charles W. Brooks (R) | November 22, 1940 |
| 11 | Washington (1) | Lewis B. Schwellenbach (D) | Resigned December 16, 1940, to become judge of the U.S. District Court for the Eastern District of Washington. | Monrad Wallgren (D) | December 19, 1940 |

Question: When did James Hamilton Lewis (D), James M. Slattery (D), and  Charles W. Brooks (R) were formally installed?
Answer: James Hamilton Lewis (D), until April 9, 1939 James M. Slattery (D), April 14, 1939 – November 21, 1940 Charles W. Brooks (R), from November 22, 1940.