13th Century Navigation System

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[Tom Wujec] explains how an astrolabe works and its importance in our technological development. He argues that an astrolabe was the world’s first “popular computer”. It measures the sky and that measurement can be used to tell time, survey land, and navigate a ship.

Astrolabes are built from three pieces and according to [Tom], educated children in the 1200’s would not just have been able to use one, but could build one as well. Electronics have certainly made our lives easier, but there’s something powerful about such a useful yet simple device.

Installing A Starscape Ceiling

fiber-optic-star-ceiling

[Mike Galloway] set out to install a lighted starscape in the ceiling of the baby room. We remember first coming across this type of thing at a Planet Hollywood restaurant at least 10 years ago. We’ve always wondered how difficult this type of thing is to install.

This setup involves an LED based illuminator and bundles of fiber optics. [Mike] first mounted the illuminator in the corner of the room at ceiling level and ran the bundles of fiber optics up into the attic. He then used a cordless dremel to drill 1/16″ holes, one for each fiber in the bundle. This translates to a lot of holes! Once everything was in place, he filled the holes with glue to hold the fibers in place, and snipped off the excess from the room-side using a fingernail clipper. We’ve embedded his video of the system in action after the break.

This may take some time, but it seems easy enough and now we know how these ceilings work.

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