Pencils of Rays

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“These pencils of rays not only flow from the points designated in the figure, but in the same manner from every other point on the surface of a visible object.” -Comstock 1850


pencil, arrow, rays


J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 242


TIFF (full resolution)

1886×2400, 454.5 KiB

Large GIF

804×1024, 83.9 KiB

Medium GIF

502×640, 48.2 KiB

Small GIF

251×320, 19.7 KiB