MISCELLANEOUS SUBJECTS AND TABLES. 331 



below Nos. I 2, or 3, it indicates colder weather; when not 

 displayed, the indications are that the temperature will re- 

 main stationary, or that the change in temperature will 

 not vary more than 4° from the temperature of the same 

 hour of the preceding day from March to October, inclu- 

 sive, and not more than 6° for the remaining months of the 

 year. No. 5, white flag, 6 feet square, with black square 

 in centre, indicates the approach of a sudden and decided 

 fall in temperature. This signal is not to be displayed un- 

 less it is expected that the temperature will fall to 42" or 

 lower, and is usually ordered at least twenty-four hours in 

 advance of the cold wave. 



Interpretation of Displays. 



No. I, alone, indicates fair weather, stationary tempera- 

 ture. 



No. 2, alone, indicates rain or snov;, stationary tempera- 

 ture. 



No. 3, alone, indicates local rain or snow, stationary 

 temperature. 



No. I, with No. 4 above it, indicates fair weather, 

 warmer. 



No. I, with No. 4 below it, indicates fair weather, colder. 



No. 2, with No. 4 above it, indicates warmer weather, 

 rain or snow. 



No. 2, with No. 4 below it, indicates colder weather, rain 

 or snow. 



No. 3, with No. 4 above it, indicates warmer weather, 

 with local rains or snow. 



No. 3, with No. 4 below it, indicates colder weather, 

 with local rains or snow. 



No. 1, with No. 5 above it, indicates fair weather, cold 

 wave. 



No. 2, with No. 5 above it, indicates wet v/eather, cold 

 wave. 



