The book in its purest form is just the same scheme repeated over and over. This scheme consists of a double page, where the left side is filled with text accompanied by an illustration on the right side, depicting what’s been written.
As the title already suggests, the main purpose of the book is as a guide on how to create perspective drawings meant for architects, artists and “anyone who delight in drawing”. With this realisation it’s much easier to understand the basic concept.
Throughout the whole book this scheme makes up for almost every page. The only exceptions that occur are either additional text or tables of measurements and proportional rules, as I assume, which support the main text.
Due to the scheme the book offers a clear overview, which allows one to easily look up certain rules or find the right instruction for your drawing. Therefore, with the mentioned purpose in mind, there are several possibilities of usage. It can be used as a library of possible perspective drawings or as a reference book for measurements and proportions. Nevertheless, the main purpose remains as that of an instruction book.
If we take a step back and take a look on the overarching theme of the schemes. It can be seen that the illustrations progressively increase in difficulty as we follow the book. Additionally, it’s visible that related topics are found near to each other.
Furthermore, it makes the overall structure visible. The book seems to be divided into three parts. Where the first two parts consist only of the mentioned scheme. Whereas the second part contains further information and the tables, which upholds the clear overview. The first part seems to be an introduction into the whole topic and techniques. Therefore, it seems like the second part is the core of the book, containing all the important instructions and illustrations.
The scheme itself shows even more detail, if we take a closer look. The framework is given to the very last detail. The whole right side is always framed the same. The left side always begins with an ornamented letter. Each Exercise has its own heading and if there is any space left, there must by some kind of drawing.
In conclusion we can say that the book is very well structured into schemes and therefore gives a clear overview. The structure enables one to easily learn and practice it, but also allows to use the book as a reference book for work.