Meanwhile, in his painting Menzel concentrated initially on realistic landscape painting, obtaining his views during the course of several sketching tours of southern Germany and Italy. (visual-arts-cork.com)
Fortunately, though, a roving Maltese artist, Charles Brochtorff, made several sketches of the work while it was in progress. (scientificamerican.com)
The documentation includes instructions as well as several sketches detailing some of the tablet's specifications, and as expected given its moniker, -LSB-...] (androidheadlines.com)