讲座图 16, 后来重新编号 47: 托马斯·马尔顿少年的视角术语

Thomas Malton Junior was an architectural draughtsman and son of the author of A Compleat Treatise on Perspective 1775. He introduced Turner to many basic principles of perspective when Turner joined his studio as a young apprentice in the late 1780s.

The diagram provides terminology related to the ‘measure point’ method, a technique favoured by draughtsmen for rendering buildings in perspective.