1. Take so-called light piping , which is used in the Callahan Tunnel under Boston Harbor. 2. Earlier gas light pipes and fittings remain to the upper and lower rear veranda's. 3. Light pipes , as seen in the diagram in the article, have a wide diameter.4. The central region, 4.1 cm in diameter, was filled by a quartz light pipe . 5. Earlier gas light pipes and fittings remain to the upper and lower rear verandahs. 6. Light pipe modes can reflect down the length of the rod in a zig-zag path.7. It is not clear from the public record how successful the Shrimp light pipes were. 8. :1 ) Light pipes are to move a broad spectrum of light a short distance. 9. On cloudy days and at night, the light pipe is artificially illuminated with a rainbow of colors. 10. While most light pipes are produced with a round cross-section, light pipes are not limited to this geometry. 
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