The Bavarian Pigeon Corps used their pigeons to carry messages and for aerial reconnaisance. In 1903, Julius Neubranner designed a tiny breast-mounted camera for carrier pigeons. The camera could be set to take automatic exposures at 30-second intervals as the pigeon flew along. The flight path was not always reliable, however! Mostly used for military purposes, the birds were introduced at the 1909 Dresden International Photographic Exhibition, where postcards of aerial photographs taken above the exhibition were very popular with the public.