This encyphered engineering book is interesting, maybe?

[DG97EEB]

Why they write an engineering book in cipher, though? What message must they hide?

The drawings show just part of an invention. Many details would be in the writing.  

I presume that this page comes from a book about (real or imagined) military technology. Like what Leonardo da Vinci produced for some of his patrons.  Thus it makes sense that the text would be encrypted, meant to be read only by people with the proper "clearance".  

A prudent General should assume that spies promptly handed to the Enemy drawings of any weapon in his arsenal.  But some key details may not be visible -- like precise dimensions and dimensional tolerances, materials, glues, heat treatments, ...

All the best, --stolfi

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"The manuscript may have provided the young Leonardo with access to Brunelleschi’s inventions and other technical equipment of the time (compare the design for a siege machine with a covered bridge) (121 ▲)."