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306 



METEOROLOGY 



[S«ct.. IX. 



During the continuance of tlie storm, and especially if 



there be reason (from its characters^ and its occurrence in 







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cane, or *^^ cyclone,'' in the sense insisted on by Mr. 



Mr. Piddington, all the 



Redfield, Colonel Reid, and 

 atmospheric appearauces and changes sliould be noted as 

 frequently as possible, particularly at changes of the 

 y/ind and in the calm centre of the vortex, should this 

 unfortunately reach the ship. Flashes of light appearing 

 in the barometer tube (not simply arising from oscillation) 

 ■thunder and lightning, particularly at shifts of the wind, 

 and their relation to sudden discharges of hail or rain 

 temperature of rain and of the sea — form and size of 



nailstones 



—whirlwinds or waterspouts occurring in the 

 cyclone, their appearance, whirlings, tracks, size, &c.~- 

 circles of light overhead in the centre of the gale, to be 

 estimated or measured as to their anmilar diameter 



sun 



moon, or stars 



if seen, and if of peculiar brilliancy or 

 culours— state of the sea as to regularity, rising, falling 



breaking, &c., particularly at the centre — veerings or oscil- 

 lations of wind, and the exact intervals in which they occur 

 moderating of the wind for an hour or two or more 



lid the state of 



after the gale has appeared to commence, « 

 the instruments and sky at the time. An exact account 

 should be kept of the vessel's coming up or felling off, 

 and the log hove, if possible, to ascertain with the utmost 

 care the ship's drift in lying to. Blasts of hot and cold 

 air—extraordinary light and darkness. Whenever partial 



clear in 



Oi. UxKy 



sky affjrc 



ds an 0'- 



pportunity, pay particular 

 attention to the direction of the upper scud. At the 

 gomg off of the gale the same attention to ail the pheno- 





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