Andrew Janssen wrote: > Kaeir might find such a system useful; the Islands and Tirmaeir are > close enough to be linked by such a system. > > As a rule of thumb, according to a website about heliographs that I > found, every inch of mirror diameter gives you ten miles of range. A > ten-inch mirror would be large enough to signal across the channels > separating the islands from each other and the mainland. I think you'll find that those mirrors are _parabolic_ mirrors, which Qaiyore doesn't have the technology to make. I believe flat mirrors give you about 100 yards per inch diameter under ideal conditions, and the best (less than flat) mirrors available on Qaiyore would be worse. Also, taking the world's curvature into account, each of your observers and mirrors would need to be a minimum of 1380 feet above sea level. Jefferson http://www.picotech.net/~jeff_wilson63/rpg/Exq_Main.html ---------------------------------------------------------------- To unsubscribe, send mail to celandra-off@phoenyx.net.
