PREAMBLE

The text mentions using certain mathematical instruments that are detailed and explained in this chapter. The eighth and final chapter is extracted from 'Essay on Perspective' by M. sGravefande, well-known for his works. This prominent mathematician provides a description, at the end of this small book, for two portable camera obscuras, which appear very intriguing. Several skilled artists have successfully used them to draw and paint views of buildings, landscapes, or anything else. We believed it would be best to conclude this work on drawing by presenting these developments here and explaining how to use them for drawing views, copying paintings, making portraits, etc. An additional description and depiction of a third camera obscura shaped like a large book, which is much simpler and more portable than the other two, has been included at the end of the chapter. This is essentially what is contained in this work, which is also accompanied by one hundred plates offering various examples of all aspects of drawing mentioned in the discourse. It includes, in particular, many studies of heads defined in large format, academic studies drawn from nature, representation of the antique statues discussed in the fifth chapter, complete with their measurements and divisions, and some studies of animals and landscapes. Since only skilled individuals were employed for engraving these plates, and no expense was spared for the execution of this work, we have reason to hope that the public will give it a favorable reception. Ultimately, the goal proposed will have been achieved if this book proves to be useful to those for whom it was composed.

Translation Notes

The term 'camera obscura' refers to an early type of image projector, used historically by artists to aid in drawing. The phrase 'habiles gens' translates to 'skilled people' or 'competent individuals', referring to craftsmen or experts hired for engraving.