DISCUSSION OF THE VERTICAL FORCE 



11 



Notes to preceding table: January 2d, 10 h 23 m , temperature observation 30 m late. January 8th, 

 10 h 23^"', instrument disturbed. January 15th, 3 h 23| m , temperature 56. 3 interpolated. February 

 6th, 4 h 23f m , and 13th, 9 h 23i m , temperature observation 15 m and 20 m late, respectively, April 

 llth, O h 23|- m and l h 23 m , readings supplied by observer. July 13th, 12 U 23i m , observation 36 m 

 late. August 26th and 27th, thirteen readings supplied by observers. October 1st, 22 h 23^ m , 

 observation 8 m late. 



Notes to above table: April 27th, 4 h 23^ m , reading supplied by observer. April 14th, 2 h 23^ m , 

 observation 12 m late. April 22d, 23d, and 28th, 14" 23| ra ; also April 22d, 15 h 23| m , readings sup- 

 plied by observer. April 22d, 16 h 23^ m , temperature supplied by observer. May 2d, I4 h 23 m , 

 reading supplied by observer. May 12th, 4 h 23| m , 9 m late. June 6th, 5 h 23| m , and 28th, I h 23| m , 

 observations 13 m and 9 m late, respectively. June 12th, O h 23^ m and l h 23| m , readings supplied by 

 observer. 



The monthly mean for January, February, and March, 1843, was obtained by adding 14, 10, and 8 

 divisions to the readings at 14 h 7 m respectively; these corrections were found by comparisons in 

 1842 and 1844. 



