This is one of three almost identical sketchbooks which Turner bought on his way to Venice in 1840, all composed of Austrian-made paper with a fake Whatman watermark (the others are no.65 and TB CCCXIII). He left Venice on 3 September and used this sketchbook for a week thereafter to record his homeward journey across the gulf of Trieste, through southern Austria to Vienna, and then down the Danube to Germany. He reached Vienna on 7 September. It was probably there that he saw some of the lithographs in Jakob Alt's famous series on the Danube (1819-26) and drew his twelve tiny copies of them which are such a notable feature of this sketchbook.
Gallery label, September 2004