Timing the Clouds to Determine the Weather 



The "Comb Nephoscope." It consists of an upright brass rod about nine feet long, bearing at 

 Its upper end a cross-piece to which a number of equidistant vertical spikes are attached. The 

 observer turns the cross-piece until the cloud appears to travel along the line of spikes, and notes 

 the time it takes to pass from spike to spike. This forms a basis from which he reckons 



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