The second genus of blowing machine is made with fans , and is likewise varied and of many forms , for the fans are either fitted to a windlass barrel or to an axle . If to an axle , they are either contained in a hollow drum , which is made of two wheels and a number of boards joining them…
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![An illustration from Novo teatro di machine et edificii per uarie et sicure operationi : co[n] le loro figure tagliate in rame é la dichiaratione, e dimostratione di ciascuna : opera necesaria ad architetti, e a quelli, ch[e] di tale studio si dilettano (1607)](https://img.insideoutlibrary.com/img/200/ia-novoteatrodimach00zonc-122-74.webp)
