albumen method, and exhibit a deal of minute detail which is entirely lost in the paper copies; and they admit further of being optically magnified and projected on a screen. Where the screen is large, the lens good, and the light strong as when using the lime ball, the magnified photographic picture reproduces the scene with such vivid reality, that some geological friends have studied the pictured slopes of the Peak with the most intense profess= =ional satisfaction, and considered this mode of exhibiting the results of travel to be a remarkable advantage for the men of the present day; thanks to Daguerre, Fox Talbot, Herschel & Archer. G. Piazzi Smyth.
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Tenerife Papers of Charles Piazzi Smyth, 1856. From The Royal Society, MS/626
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