Philosophical Transactions 92 (1802), Part 1, pp. 12-48. London: W. Bulmer for G. & W. Nicol, 1802. 4o (295 x 235 mm). Engraved plate by James Basire. (Some browning to text). Original blue wrappers, "1802" and "1" hand-inked on spine, UNCUT AND UNOPENED (spine worn). FIRST EDITION OF "AN EPOCH-MAKING CONTRIBUTION TO THE THEORY OF LIGHT IN ALL ITS PHASES". Read as the Bakerian Lecture, November 12, 1801, Young firmly endorsed Huygen's wave theory of light, displacing Newton's corpuscular theory which had been favoured for most of the 18th century, and so found explanations for unresolved optical phenomena such as interference. Dibner 152; PMM 259; Norman 2275. -- YOUNG. "An account of some cases of the production of colours, not hitherto described". In Philosophical Transactions 92 (1802), Part 2, pp. 387-397. London: W. Bulmer for G. & W. Nicol, 1802. 4o (295 x 233 mm). Original blue wrappers, "1802" and "2" hand-inked on spine, UNCUT AND UNOPENED. FIRST EDITION. A further explaination of the wave theory. Norman 2276. (2) " /> YOUNG, Thomas (1773-1829). "On the theory of light and colours". In <I>Philosophical Transactions</I> 92 (1802), Part 1, pp. 12-48. London: W. Bulmer for G. & W. Nicol, 1802. 4<SUP>o</SUP> (295 x 235 mm). Engraved plate by James Basire. (Some browning to text). Original blue wrappers, "1802" and "1" hand-inked on spine, UNCUT AND UNOPENED (spine worn). FIRST EDITION OF "AN EPOCH-MAKING CONTRIBUTION TO THE THEORY OF LIGHT IN ALL ITS PHASES". Read as the Bakerian Lecture, November 12, 1801, Young firmly endorsed Huygen's wave theory of light, displacing Newton's corpuscular theory which had been favoured for most of the 18th century, and so found explanations for unresolved optical phenomena such as interference. Dibner 152; PMM 259; Norman 2275. -- YOUNG. "An account of some cases of the production of colours, not hitherto described". In <I>Philosophical Transactions</I> 92 (1802), Part 2, pp. 387-397. London: W. Bulmer for G. & W. Nicol, 1802. 4<SUP>o</SUP> (295 x 233 mm). Original blue wrappers, "1802" and "2" hand-inked on spine, UNCUT AND UNOPENED. FIRST EDITION. A further explaination of the wave theory. Norman 2276. (2) | Christie's