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16 



METEOROLOGY. 



[Sect. IX, 



S' 



This, however, should not be taken for granted, Bv 

 going aloft the observer may put himself out of the reach 

 of much of the interfering influence, taking with hix]) an 

 electroscope and a common jointed fishing-rod, having a 

 dass stick well varnished with shellac substituted for its 



smallest joint to project into the atmosphere. To the end 

 of the glass must be fixed a metallic rod terminating in a 



point, or carrying a small brass lantern, in which a lamp 

 is burning, and connected with the electroscope by means 

 of a fine copper wire. The electroscope may be either 

 Saussure's pith ball, or Singer's gold leaf electrometer, 

 and when charged the nature of the electricity m.ay he 



tested by excited glass or sealing wax. 



Auroral Phen 



All 



uch should be 



minutely 



registered, and all their phases, especially the formation, 

 extent, situation, movement and disappearance of arches, 

 or any definite patches or banks of light. An acquaint- 

 ance with the principal stars of the constellations is neces- 

 sary to observe such phenomena with effect, and the 

 observer will do well to provide himself for the purpost^ 

 with planispheres, on wdiich only the more conspicuous 

 stars are indicated, w^ith their allineations. The exact 



time (true at least to the nearest minute) of any such 

 definite body of light being centrally on any known star 

 should be observed, as a means (by the aid of correspond- 

 ing observations) of determining its real situation and 



The slovv drifting motion of such masses (in 

 north latitudes generally southward — query if the reverse 

 in south ?) should be specially attended to. Pulsations, 

 like waves of light, rushing up from the horizon, should 

 be also particularly remarked, and any appearance of 

 patches of dejinite forms rendered visible hy such pulsations 



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