elevated Rain-gauge, as caused by Wind. 



425 



Ratio of rain in lower 



gauge to that in Howard's remarks (in full). 



upper gauge. 





300 . 



. . Windy night ; nimbus at sunset. 



2-78 . 



. . Stormy a.m. ; wet p.m. 



2-33 . 



. . Cloudy ; much wind ; stormy night. 



2-20 . 



. . Much cloud with a fresh breeze. 



2-00 . 



. . Windy night. 



1-75 . 



. . Three currents in the air. 



1-61 . 



. . Showery day ; cirrostratus evening. 



1-60 . 



Misty rain about midday ; little wind veer- 





ing from S.W. to E. 



119 . 



. Cloudy; drizzling. 



1 17 . 



Rain by night. 



1-17 . 



. (No remark.) 



1-11 . 



Showers chiefly by night. 



1-10 . 



. Rain by night. 



M0 . 



(No remark.) 



1-08 . . 



. Rain by night. 



1-00 . 



. Clear a.m. with dew; nimbi; vane S.E. 





p.m., a heavy shower to S. ; wind veered 





by S. to N.W. ; then much cloud and 





rain. 



1-00 . . 



Showers. 



12. At the Greenwich Observatory, measurements of rain 

 from three gauges placed at different heights have been daily 

 recorded for about twenty years past. Examining the individual 

 results, I was surprised to find great irregularity and want of 

 accordance. Thus several hundredths of an inch of rain are often 

 registered in the lowest gauge and none in the highest. Occa- 

 sionally the middle gauge alone has caught any rain ! The fol- 

 lowing will serve as a rather extreme specimen of these dis- 

 cordances : — 



1844. Jan. and Feb. 



30th. 



31st. 



2nd. 



6th. 



7th. 



9th. 





inch. 



inch. 



inch. 



inch. 



inch. 



inch. 



Highest gauge 



•01 



•02 



•08 



•08 



•21 



•00 



Middle ,, 



. -oi 



•00 



•19 



•17 



•11 



•33 



Lowest „ 



. -01 



•04 



•21 



•18 



■23 



•16 



These observations having been made by gentlemen of high 

 ability and well-known scientific zeal, the discordances can only 

 be attributed to the erroneous nature of the rain-gauge, and to 

 the very unsuitable position and form of the Greenwich Observa- 

 tory for rain observations : of course it is useless to look for any 

 uniform law or ratio where such discrepancies may occur. The 

 discordances, too, have no obvious relation with the force of the 



Phil. Mag. S. 4. Vol. 22. No. 149. Dec. 1861. 2 F 



