Join Date: Sep 2008
Location: Bavaria, Germany - the center of 15th and 16th century gunmaking
This the so-called Buch von den probierten Künsten (on well-tried arts), printed in 1535.
I attached some samples which are of interest in our thread although Helm's original intention was to demonstrate fireworks as a means of merrymaking.
The bottom attachments depicts a notable device quite similar to some presented by Franz Helm; Veste Coburg collections;
and two glass hand grenades for the so-called Greek Fire, 10th-12th c., and a few caltrops; National Historic Museum Athens.