Straight Prisms

| View Cart ⇗ | Info

“Condensing Straight Prisms.—These, either by reflexion or refraction or both, cause a ray fr proceeding in any compass bearing from a fixed light apparatus AA to emerge in the direction, e.g., parallel to the corresponding ray fb, which proceeds in the same compass bearing from another part of the apparatus and so of any other ray fc which is bent parallel to the ray fa.” —The Encyclopedia Britannica, 1910


The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)


TIFF (full resolution)

2400×2449, 427.9 KiB

Large GIF

1003×1024, 50.4 KiB

Medium GIF

627×640, 26.0 KiB

Small GIF

313×320, 10.7 KiB