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[Use of Daguerreotypes by John Ruskin as artistic documentation]
John Ruskin The Seven Lamps of Architecture (New York: John Wiley & Sons, 1884), Preface, p.x.
So far, however, as their coarseness and rudeness admit, the plates are valuable; being either copies of memoranda made upon the spot, or (Plates IX. And XI.) enlarged and adapted from Daguerreotypes, taken under my own superintendence. Unfortunately, the great distance from the ground of the window which is the subject of Plate IX. Renders even the Daguerreotype indistinct; and I cannot answer for the accuracy of any of the mosaic details, more especially of those which surround the window, and which I rather imagine, in the original, to be sculptured in relief. The general proportions are, however, studiously preserved; the spirals of the shafts are counted, and the effect of the whole is as near that of the thing itself, as is necessary for the purposes of illustration for which the plate is given. For the accuracy of the rest I can answer, even to the cracks in the stones, and the number of them; and though the looseness of the drawing, and the picturesque character which is necessarily given by an endeavor to draw old buildings as they actually appear, may perhaps diminish their credit for architectural veracity, they will do so unjustly.