Yes, let's not forget me !

Indeed, in such case I have no previous occurrence in mind.

Both. The theatres of machines were resumes.

You publish the book with pictures and small descriptions of what you devised and let it spread around. You take care to not say everything so that, if someone wants something from the book, they can't do it by themselves and have to call you, because you're the only one who know what the drawings in the book miss.

And there, you have a job. That was the normal way for engineers to get jobs during late Middle-Ages, many did so.

Bellifortis is indeed the theatre of machines of Kyeser. If you didn't find anything on Talhoffer - and I made another mistake, there's only on L - , which seems weird, you can try a video on youtube explaining everything called something like "Talhoffer's weird inventions".

I don't have any ressource at hand in English, unfortunately, but the term isn't that rare, you will find easily.

Sorry, I wrote "Kaiser" by mistake, it's Konrad Kyeser.

Hans Tallhoffer is most reknown for being a fencing master, so I advise you to add "inventions" in your google search to see his book.

Use quotation marks around the terms, like this : "theatre of machine", so that google looks for exactly this expression, or else you wilm have results like "new machines in theatres around the globe are bla bla bla" that we don't care about.

That's not true, unfortunately.

This practice existed way before and is called a "theatre of machines" : a book in which you expose your inventions and capabilities, as currently we do with "portfolio".

Konrad Kaiser Kyeser and Hans Tallhoffer are two persons reknown for theirs and they predate Da Vinci by more than a century.

Edit : mistake on Kyeser's name.

Redditor, I will submit this theory to a benchmark. Update in six hours. If I don't come back, it's because I'm dead of asphyxia in the line of duty. Tell my waifu pillow that I love her and my neighbour's dog that he's been adopted.

But boy, would they smell it !