I prefer hard copies anyway:
http://used.addall.com/SuperRare/submitRare.cgi?author=&title=pirotechnia+of+Vannoccio+Biringuccio&keyword=&isbn=&order=PRICE&ordering=ASC&binding=Any+Binding&min=&max=&exclude=&match=Y&dispCurr=USD&timeout=20&store=ABAA&store=Alibris&store=Abebooks&store=AbebooksAU&store=AbebooksDE&store=AbebooksFR&store=AbebooksUK&store=Amazon&store=AmazonCA&store=AmazonUK&store=AmazonDE&store=AmazonFR&store=Antiqbook&store=Biblio&store=BiblioUK&store=Bibliophile&store=Bibliopoly&store=Booksandcollectibles&store=Half&store=ILAB&store=LivreRareBook&store=Powells&store=Strandbooks&store=Wbm&store=ZVAB
The cheapest one showing up when I searched is a 1966 MIT edition for $10. Buy it, shear off the binding, run it through a scanner (with OCR for good measure), and upload it to Scribd. Give back, man!