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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Archibald Williams | USA | 47.2 |
| 2 | William Roberts | GBR | 48.0 |
| 3 | John Loaring | CAN | 48.1 |
| 4 | Mario Lanzi | ITA | 48.2 |
| 5 | Pierre Skawinski | FRA | 52.0 |
| Did not start | |||
| Harold Smallwood | USA | ||
| Rank | Name | Nation | Time |
| 1 | James LuValle | USA | 47.1 |
| 2 | Godfrey Brown | GBR | 47.3 |
| 3 | William Fritz | CAN | 47.4 |
| 4 | Godfrey Rampling | GBR | 47.5 |
| 5 | Juan Carlos Anderson | ARG | 48.5 |
| 6 | Hermann Blazejezak | GER | 49.2 |