The postcard in the foreground is from the unsuccesful mail delivery flight that took place at Dirlingen, near Osnabruck, on 15 April 1831. On that date 188 cards were carried to a height of 1500 to 1800 metres before the rocket carrying them came down near to its starting point. The postcard behind it was carried on a similar night-time experiment that took place on 10 November 1933 at Haselfelde. The stamps pictured were designed for the International Air-Post Exhibition (APEX) of 1934 although, due to safety fears, rockets were never used for postal delivery.
© Science Museum / Science & Society Picture Library