JF Ptak Science Books Quick Post
Luis Collado de Lebrija, the Royal Engineer of the Army of Lombardy and Piedmont, wrote his superior artillery manual Practica Manuale di Artegliteria and published it in 1588--he was one of the five leading military engineers of the late 16th century. The image below is an interesting one from that book, showing a large cannon bombarding what possibly might be a Turkish city. In any event, the trajectory of the very large shell seems to me to be a little odd at first, looking as though it was shot high and straight up, coming down to the right; but looking at it again, the trajectory is back on track going forward 1000 meters than going up and down. And then, again, another look, and the perspective seems flat again, and back and forth it seems to go if you let it.