The Investigation of the Rainbow, design for plate 66 in the Physica Sacra, vol. 1, by Johann Jakob Scheuchzer, Johann Melchior Füssli, Swiss, 1677–1736, Christian Ulrich Wagner, German, 1686–1763, Brush and wash, pen and brown, black ink on cream laid paper, A gentleman with a dog is surrounded by a small circular rainbow and faces a mountain with a cascading waterfall. The picture contains two large diagrams - the upper portion of the picture consists of two circles and diagonal lines, and the lower portion contains two arches and diagonal lines. The letters P and O appear

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Photo credit: © Artokoloro / Alamy / Afripics
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