J.M.W. Turner: Sketchbooks, Drawings and Watercolours

ISBN 978-1-84976-386-8

Joseph Mallord William Turner Lecture Diagram: A Triangle c.1817-28

Joseph Mallord William Turner 1775–1851
Lecture Diagram: A Triangle circa 1817–28
Turner Bequest CXCV 49
Pencil and watercolour on white wove paper, 485 x 694 mm
Watermarked ‘J WHATMAN | TURKEY MILLS | 1817’
Inscribed by John Ruskin in red ink ‘49’ bottom right
Accepted by the nation as part of the Turner Bequest 1856
Made in connection with his lectures as Professor of Perspective at the Royal Acasdemy, this diagram of a triangle may have been used in his later lectures on geometry as there is a related sketch in his notes.1
Turner, ‘Royal Academy Lectures’, circa 1807–38, Department of Western Manuscripts, British Library, London, ADD MS 46151 W folio 8.
Technical notes:
Peter Bower (unpublished notes)1 writes that the sheet is Super Royal size Whatman paper made by Finch and Thomas Robert Hollingworth, at Turkey Mill, Maidstone, Kent.
Notes in Tate catalogue files.
Blank, save for an inscription by an unknown hand in pencil ‘46’ bottom left.

Andrea Fredericksen
January 2004

Supported by The Samuel H. Kress Foundation

Revised by David Blayney Brown
January 2012

How to cite

Andrea Fredericksen, ‘Lecture Diagram: A Triangle c.1817–28 by Joseph Mallord William Turner’, catalogue entry, January 2004, revised by David Blayney Brown, January 2012, in David Blayney Brown (ed.), J.M.W. Turner: Sketchbooks, Drawings and Watercolours, Tate Research Publication, December 2012, https://www.tate.org.uk/art/research-publications/jmw-turner/joseph-mallord-william-turner-lecture-diagram-a-triangle-r1136784, accessed 29 July 2021.