'Artilleriebuch' (BSB Cgm 909) by Walther Litzelmann was recently digitised and uploaded by the Bavarian State Library.
It is a ~500 page paper manuscript from 1582 filled with sketches of bombs, cannons and fireworks, for the most part. The elaborate titlepage advises (thanks NINA!) that Litzelmann belonged to the Bavarian Armoury or Arsenal at Ingolstadt and that the secrets of saltpetre and gunpowder production would be revealed within.
There are no references to the manuscript or the author online
[See George's detailed comments below]