The volvelles in this edition of the Sphaera were reproduced on two separate leaves, and the fragility of the original text precludes obtaining an image of both leaves at once--which is why this is such a poor quality image.

Importantly, there is text overleaf.  This may explain why the instruments in this text are not assembled: to cut them out would be to lose part of the text.

Image used Courtesy of Smithsonian Institution Libraries