Recent news of invention and engineering:
> On the Anacostia River near Washington's Navy Yard, engineers tested fluorescent buoys to be used as markers for alighting seaplanes. Having no hot filaments to burn out, fluorescent lamps (coated inside with powders which shine by electrical agitation) are durable as well as efficient. The buoy lamps are carried on inflated floats shaped like doughnuts, which contain short-wave radio receivers so that the lamps can be turned on & off by remote control from shore.
>Breaking up coal in veins by use of explosives is still standard practice in U. S. mining, and despite precautions is...
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