METEOROLOGICAL OBSERVATIONS AT PLYMOUTH. 167 



Table XXII. 





g 



1 



1 



■3 



Hour. 



i 



1 



1 



i 





s 



W 



s 







1a.m. 



47-52 



46-20 



1-32 



4500 



2 



47-33 



46-03 



1-30 



44-75 



3 



47-11 



45-92 



1-19 



44-75 



4 



47-00 



45-66 



1-34 



44-25 



5 



46-98 



45-77 



1-21 



44-75 



6 



47-41 



46-01 



1-40 



44-50 



7 



48-44 



46-83 



1-61 



45-25 



8 



49-68 



47-51 



2-17 



4500 



9 



51-30 



48-50 



2-80 



35-26 



10 



52-84 



49-45 



3-39 



46-25 



11 



53-00 



5002 



3-88 



46-75 



12 



54-51 



50-40 



4-14 



46-75 



1 A.M. 



45-83 



50-55 



4-28 



46-75 



2 



54-77 



50-44 



4-33 



46-75 



3 



54-25 



50-24 



401 



46-75 



4 



53-45 



49-80 



3-65 



46-75 



5 



52-27 



49-06 



3-21 



46-25 



6 



51-24 



48-46 



2-78 



46-00 



7 



50-28 



47-90 



2-38 



45-75 



8 



49-44 



47-51 



1-93 



45-75 



9 



48-83 



47-17 



1-66 



45-60 



10 



48-48 



46-93 



1-55 



45-60 



11 



48-10 



46-66 



1-44 



45 00 



12 



47-80 



46-43 



1-37 



45-00 



Mean 



50-32 



47-89 



2-43 



45-60 



It appears by these results, 



1st. That the greatest dew point does not exceed 47 degrees 

 or the point of minimum temperature. 



2nd. That the least dew point does not fall below 44 degrees, 

 and occurs about the time of minimum temperature, viz. at 4, 5, 

 6, A.M. 



3rd. That the mean dew point = 45*6 diiFers from the 

 mean temperature = 50*3 by about 5 degrees, which may 

 therefore be taken as the mean dryness on the thermometric 

 scale. 



4th. That the mean dew point occurs twice in the twenty- 

 four hours, viz., about 9 a.m. and 9 p.m., the interval being 

 nearly twelve hours. 



5th. The mean temperature of the dew point approaches very 

 nearly the mean minimum temperature of the wet bulb ther- 

 mometer. 



These results are, so far as I know, the first which have been 



