Uchatius said that his model projector was equipped with space for twelve pictures painted on glass slides, but he added: “There are no insuperable obstacles in the way of constructing a similar apparatus with 100 pictures, thereby a moving tableau with an action lasting one-half minute could be presented. The apparatus would not need to be more than six feet high.” This shows that Uchatius also was looking ahead to the story motion picture. Until the middle 1890s there were no real motion picture scenes on any screen for more than the one-half minute indicated by Uchatius. His machine was the basic model for four decades and had an influence on the design of many early motion picture projectors and cameras. Uchatius pointed out that the projector would be useful in demonstrating its own principle in physics and vision classes and could show in a vivid way action of sound waves and “indeed all motions which cannot be demonstrated by mechanism.” The first motion picture projector dealer was W. Prokesch, an optician and lens maker of 46 Lainbruge Street, Vienna, who, Uchatius said, “prepares apparatuses of this sort with greatest precision and upon request also furnishes pictures therefor.” Prokesch wrote many years later that the records show that Uchatius began his correspondence with the optical firm about the motion picture projector on February 16, 1851. It is possible that Uchatius solved the problem of the projector soon after the assignment was given to him by General von Hauslab in 1845. But he was a very busy man from that year, when he became a member of the Academy of Science, until the 1851–53 period when he had time to complete the work, arrange for commercial construction of projectors and write the report for the journal of the Polytechnical School, Akademie der Wissenschaften, _Sitzungsberichte_. In 1846 Uchatius was given orders to open up a section of the gun foundry and astounded military circles by producing the then great quantity of 10,000 six-pound cannon balls in three months. He taught the Emperor’s brothers at the Polytechnical School in 1847. At the age of 37, in 1848, when he had a family of three children and had been in the artillery service for 19 years, he received a promotion to first lieutenant. Advancement was slow because this extremely talented man had no influence in political circles. In 1848 Uchatius was assigned to Italy and assisted at the siege of Venice. There he started the unenviable precedent of the aerial bombardment of cities. In three weeks he had constructed more than 100 balloons fitted to carry explosive charges to be dropped on the heads of the “besieged, rebellious Venetians.” Uchatius and his brother, Joseph, studied the problem on the spot. The experiment was only partially successful. The Venetians were probably as terrified by rumor of bombs falling from the heavens as were the invaders under Marcellus before Syracuse when Archimedes developed his Burning Glasses.