Doru Todericiu, profesor de Știință și Tehnologie, a găsit manuscrisul misterios în anul 1961, în Arhivele orașului Sibiu.
On the making of cannons and missiles
Conrad Haas (1509-1576), a famous 16th century military engineer, was a pioneer of rocket propulsion and, indirectly, one of the earliest pioneers of space exploration. Born near Vienna in a village called Dornbach (today part of the XVII. district of Vienna), he entered the service of the Holy Roman Emperor Ferdinand I. and joined the imperial armed forces going to Transylvania in 1551 where he was appointed Arsenal Master in Sibiu (German: Hermannstadt).
In 1529 he began writing an ambitious and extraordinary innovative treatise on rocket technology. Using his knowledge of mathematics, chemistry, physics, ballistics and pyrotechnics, he produced a text which presents for the first time many concepts and designs that became established in modern rocket technology. He is thus one of the undisputed pioneers of modern missile and rocket engineering as his plans also include manned rockets.