Brazilian troops take readings from optical theodolite in Poretta, Italy, during World War 2. 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. (Note: Opening slate containing name, Sgt. Louis Cook, refers to Louis R. Cook, of the 196th Signal Photo Co.)