hours each. This number is sufficient for all (that is to say, two corresponding points on photo- full arm length, the three luminous dots reappear, graphs of the same object, obtained by displacing the purposes requiring manual labor. objective through the distance between the eyes) be As fast as… … was built at Orange, Texas, and towed up the Atlantic picture has, however, alone to. be taken into account A CURIOUS OPTICAL ILLUSION ILLUSTRATING in ordinary practice, the mutual distance of the axes coast to Sparrows Point, where its machinery was in- INVERSION OF IMAGES. of the eyes being…
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