48 



H. F. Blanford — Barometric Tides, ^c. 



therefrom ; and tlie hourly values calculated from the formula : in conjunc- 

 tion with which I give also the corresponding values for the Calcutta curve. 



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■/ 









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y' 



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u- 



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Means of 



' olservations of 



Pressure. SandJieads. 



Janimry 





Hom\ 



No. of 

 obs. 



Mean. 



Hour. 



No. of 

 obs. 



Mean. 



Hotrr. 



No. of 

 obs. 



Mean, 



Mid. 

 4 



37 

 62 



30-029 

 29-983 



8 

 Noon. 



46 

 64 



30-047 

 30-042 



16 

 20 



38 

 50 



30-004 

 30-027 



• BesseVs formula. Sandlieads. January. 

 X = 30-022 + -0068 sin (n 15*^ + 272° 27') + '0288 sin 0^ 30° -f 152° 3> 

 + -0093 sin (71 45° + 90°). 



Computed values. Sandheads and Calcutta. January. 



Hom\ 



Sandheads. 



Calcutta. 



Hour. 



Sandheads. 



Calcutta. 



Moan 



30-022 



30.011 



Mean. 



30-022 



30^011 



Mid. 



+ -016 



+ -003 



Noon. 



+ -Oil 



+ ^032 



1 



— -001 



— •006 



13 



— •001 



— •002 



2 



— •021 



— •015 



14 



— •010 



— -031 



3 



— •037 



— •021 



15 



— •014 



— -048. 



4 



— •042 



— •024 



16 



— •016 



— -054 



5 



— •033 



— •020 



17 



— •016 



— •051 



6 



— •013 



— •005 



18 



— •014 



— •040' 



7 



+ •oio 



+ ^021 



19 



— •008 



— •024 



8 



+ -028 



+ -050 



20 



+ -002 



— -007 



9 



+ ^037 



+ -072 



21 



+ -014 



+ -OOS 



10 



+ ^035 



+ •078 



22 



+ ^2Z 



+ 'OU 



11 



+ ^024 



+ -062 



23 



+ -024 



+ •010 



