Abstract
PLACE the heliostat in position, and bring a slender beam of light into the darkened room. Then get a small looking-glass, or hand-mirror, and a carpenter's steel square, or a sheet of stiff paper, having perfectly square corners. Hold the mirror in the beam of light. At once you see there are two beams of sunlight, one from the heliostat and another from the mirror. Hold the glass toward the heliostat, and you will see this second beam going back toward the window.
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Reflection of Light 1 . Nature 17, 427–431 (1878). https://doi.org/10.1038/017427a0
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DOI: https://doi.org/10.1038/017427a0