ut sine animali moveantur cum impetu inaestimabili, et instrumenta volandi et homo sedens in medio instrumenti revolvens aliquod ingenium per quod alae artificialiter compositae aerem verberent ad modum avis volantis
that without the animal moved swiftly priceless, and instruments to fly and a man sitting in the middle of a revolving nature of the instrument through which the wings of the art combined air reverberates like a bird flying