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. As fast as the meadow is filled in to the requisite but, this… … 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 generally constant, viz. equal to stalled. It was then taken by sea to the present scene about 65 millimeters…
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