In “a book of architecture, containing designs of buildings and ornaments” the text is mainly situated between page 6 and 37. He is organized in paragraphs over the whole book with a quite big font size. The typeface looks surprisingly similar to the ones we use everyday like “Calibri” in Word. The rest of the book, starting at page 39, is filled with architectural drawings of buildings but also a lot of drawings of ornaments. There is a big variety in those drawings. You can find everything from floor plans over sections and elevation to perspectives. There are some foldout spreads (probably the most important drawings) and some smaller drawings together on one page, but most likely the book presents full-page drawings. The drawings are copper engravings, and they’re numbered from Plate I to plate CL. The book contains a list with all the plates and a short description to every single one.
Comparing the 31 pages of text to the 150 pages (plates) of images, those copper engravings not only seem to be more important than the text but also turn out to be the key part of the whole book. Those copper engravings have been made by James Gibbs and were a gift to John Campbell, duke of Argyll and Greenwich in the 18th century. This gets clear at the very beginning, where James Gibbs writes:
“It is a particular pleasure to me that this publication gives me an opportunity to declare the real sentiments of gratitude and respect with which I am, My LORD, your GRACES most dutiful and most obliged humble servant, James Gibbs.”
According to all that, the book suggests an intense study of the designs of ancient buildings and ornaments in Great Britain. All in all it would most likely be used as an academic study.