Theory of Operation
The rain gage works by funneling collected rain to land on the pivot-point of a two-sided "bucket." When one side fills, it pivots down -- causing the "bucket-tip" to be recorded, emptying the bucket and bringing the empty side under the collection point. Each bucket-tip occur when 0.01 inches of rain has been collected.
Rain Gauges Map
(View an enlargeable version of the Rain Gauges Map)