Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
“Now comes the most difficult part of the task of mounting. Hitherto all has been merely mechanical; certain rules had to be observed only. But now the instructor must pause for want of words wherewith to express his meaning, for who can tell an artist how to put in those bold and hasty strokes with which he maps out his picture?" (71)
A historical, not modern book. It's interesting to read historical techniques, but if you are looking for an instruction book, get something more modern.