and so on. The observation of the cloudsthus enables us to know : 1, the approach of centersof disturbance; 2, the relative position that we occupyin the region where these centers may cause atmo-spheric perturbations. By combining these data with the indications ofthe barometer and taking account… … wires are stretched parallel to the diagonals. Theposts serve as resting places for the observers head,and he can thus very easily determine the directionfollowed by the clouds by watching them and the wiresat the same time. As much as possible he should observe the regionsof the sky that are not…
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