at Leith Fort, every Hour of the Day, in 1824 and 1825. 3] 



V. On the Parabolic form of the different branches of the Mean 

 annual Daily Curve. 



Before concluding this Report, I was desirous of ascertain- 

 ing if the different branches of the daily curve had a resem- 

 blance to any known curve. Their similarity to the parabo- 

 la is very obvious, from Fig. I. of Plate I., where they are 

 distinctly projected ; and I therefore calculated the following 

 table, upon the supposition that AB, BC, CD, and DE, 

 were parabolic branches of the following dimensions : 



Branch AB, Ordinate, AH =513 



Abscissa, BH == 172 or 2°.872 



The ordinates 513 + 253 + 347 + 327 are = 1440' = 24 

 hours ; and the abscissa BH = 2°.872, and DG = 3°.266, 

 when reduced to the same scale as that of the ordinates, be- 

 come 172' and 196', as one degree of temperature on the pro- 

 jection is equal to one hour. The abscissas which represent 

 the temperature were reconverted into degrees. 



TABLE, showing the Differences between the Mean Annual Hourly Tem- 

 perature for 1824 and 1825, as observed, and calculated on the suppoti- 

 tion of these being the abscissa of Parabolas. 



