Hans Stuck's Auto-Union in the pits, 1930s.
© NMeM / Zoltan Glass / Science & Society Picture Library
Photograph by Zoltan Glass. Mechanics working on car No 1, Hans Stuck's Auto-Union A-Type V16. Alfred Neubauer, (right), manager of the Mercedes Grand Prix team, devised a system of boards and flags to keep the drivers informed of their speed and position.