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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | William Roberts | GBR | 47.7 |
| 2 | Harold Smallwood | USA | 48.6 |
| 3 | Mario Lanzi | ITA | 48.8 |
| 4 | Zoltan Zsitva | HUN | 48.4 |
| 5 | Dennis Shore | RSA | 49.6 |
| 6 | Gunnar Christensen | DEN | 51.0 |
| Rank | Name | Nation | Time |
| 1 | Hermann Blazejezak | GER | 48.2 |
| 2 | Godfrey Brown | GBR | 48.3 |
| 3 | William Fritz | CAN | 48.4 |
| 4 | Bertil von Wachenfeldt | SWE | 48.5 |
| 5 | Georges Henry | FRA | 49.4 |
| 6 | Borje Strandvall | FIN | 49.9 |
| Rank | Name | Nation | Time |
| 1 | Archibald Williams | USA | 48.0 |
| 2 | Juan Carlos Anderson | ARG | 48.7 |
| 3 | John Loaring | CAN | 49.3 |
| 4 | Olle Danielsson | SWE | 49.6 |
| Did not start | |||
| Jozsef Vadas | HUN | ||
| Adolf Metzner | GER | ||
| Rank | Name | Nation | Time |
| 1 | James LuValle | USA | 47.6 |
| 2 | Pierre Skawinski | FRA | 48.0 |
| 3 | Godfrey Rampling | GBR | 48.0 |
| 4 | Rudolf Klupsch | GER | 48.8 |
| 5 | Marshall Limon | CAN | 48.9 |
| 6 | Karel Knenicky | TCH | 49.6 |