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Optics of Wollaston camera lucida
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From W. H. C. Bartlett, "Elements of Natural Philosophy", 1852, A. S. Barnes and Company. Photocopy kindly provided by Tom Greenslade, Department of Physics, Kenyon College. This image was scanned from the photocopy and cleaned up by Daniel P.B. Smith. This version is licensed by Daniel P.B. Smith under the terms of the Wikipedia Copyright.