Hans Geier's Mercedes in the pits, Germany, 1930s.
© NMeM / Zoltan Glass / Science & Society Picture Library
Photograph by Zoltan Glass. Rear view of car No 8 surrounded by mechanics, with Hans Geier at the wheel. Alfred Neubauer, (left), manager of the Mercedes Grand Prix team, devised a system of boards and flags to keep the drivers informed of their speed and position.