Prepared in connection with his lectures as Professor of Perspective at the Royal Academy, Turner’s diagram demonstrates a method by Andrea Pozzo (1642–1709) for putting a cube in perspective. Turner based it on an illustration from Dr Brook Taylor’s Method of Perspective Made Easy; both in Theory and Practice: in Two Books (London 1768, vol.II, pl.XIX, fig.6) by John Joshua Kirby (1716–74).1 Turner’s diagram corresponds to a section of his lecture manuscripts containing discussion of a wide variety of methods of perspective, which Maurice Davies considers to be the late, extended version of Turner’s history of techniques in Lecture 3.2 The text and diagram would therefore have supplemented existing material, such as Lecture Diagram 34 which illustrates another of Pozzo’s methods (Tate D17048; see also Tate D07980).
Peter Bower writes that the sheet is Imperial size Whatman paper made by Finch and Thomas Robert Hollingworth, at Turkey Mill, Kent. Bower notes: ‘This paper is very heavily sized and bears some relationship to the Parchment Substitute papers produced by various hand made papermakers in the nineteenth century (and into the twentieth) for legal documents. Sometimes papermakers don’t quite keep up their quality control. In the case of this particular sheet [and about nine others from the same batch that Turner also used for diagrams] the mould has been left, probably overnight, without being cleaned and small amounts of pulp have dried between the support bars under the mould cover and the two layers of woven wire making up the cover. This affects the drainage of the sheet during formation and leaves a clear impression of the mould’s actual structure and construction’.1
Notes in Tate catalogue files.
Blank, save for an inscription by an unknown hand in pencil ‘42’ bottom left
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