Brazilian troops release balloon, take readings and call on telephone from optical theodolite in Poretta, Italy.

Brazilian troops take readings from optical theodolite in Poretta, Italy. Three Brazilian troops stand on roof. One soldier holds a balloon over telescope. They note readings. Trees in the background. Snow on ground and roof. Soldier releases balloon on signal. Soldiers check flight with theodolite and take notes. Soldier adjusts theodolite. Observer with telephone calls reading from theodolite