Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Circuit | Date | Winning driver | Winning constructor | Report |
| --- | --- | --- | --- | --- | --- |
| Vanderbilt Cup | Santa Monica | 26 February | Ralph DePalma | Mercedes | Report |
| American Grand Prize | Santa Monica | 28 February | Eddie Pullen | Mercer | Report |
| Indianapolis 500 | Indianapolis | 30 May | René Thomas | Delage | Report |
| Coppa Florio | Madonie | 31 May | Felice Nazzaro | Nazzaro | Report |
| Russian Grand Prix | St Petersburg | 31 May | Willy Scholl | Benz | Report |
| Tourist Trophy | Isle of Man | 10–11 June | Kenelm Lee Guinness | Sunbeam | Report |
| Elgin Trophy | Elgin | 22 August | Ralph DePalma | Mercedes | Report |
Question:
Name the Winning driver of mercedes on 22 august?
Answer:
Ralph DePalma