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Engraved geometric plate showing the flat net of an octagonal pyramid frustum with shaded octagonal ends.

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The Frustum of an Octogonal Pyramid, John Lodge Cowley (1765). Via artnap.com

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Why is this public domain? John Lodge Cowley died in 1797; this work is in the public domain.

About this work

This engraved plate, labelled Plate XXXIII and Book 5, shows the development of an octagonal pyramid frustum as a flat net with two octagonal ends and trapezoidal faces radiating around them. Dense concentric engraved lines fill the two octagonal bases, which are drawn as shaded geometric figures. The print is attributed to John Lodge Cowley and dated 1765.