﻿YI. 



Register of the Thermometer for 36 Years, from 1821 to 1856, to which is added the 

 Quantity of Rain falling in Boston, Mass., for 34 Years, from 1823 to 1856. 



By JONATHAN P. HALL. 



All the observations dui-ing the pei-iod of thirty-six years have been made at the 

 same house, Xo. 51 Hancock Street, but the thennometers have been changed. 

 During an early portion of the observations, one thermometer only was used, placed 

 on the eastern side of the house, and during some part of the year the observation 

 at 7 A. M. may have been affected by reflected heat. Aftervrards, the observation at 

 that hour was made by a thermometer placed on the western side of the house, in 

 no way affected by reflected heat. Since June, 1851, all the observations have been 

 made by a standard thennometer of the manufacture of Troughton and Simms, 

 London, and so placed as not to be affected by reflected heat, at any part of the year, 

 or hour of the day. The estimated height of the thermometer above marsh level is 

 eighty-two or eighty-three feet. Hours of observation, 7 A. M., 2\ P. M., and 

 9 P. M. 



The rain has been collected in a tin cylindrical vessel, eighteen inches in height, 

 and twelve inches in diameter, placed about ninety feet above marsh level, and 

 measured by a scale graduated to tenths of an inch. The snow has been melted 

 and then measured. 



In the tables, F denotes Fair. 



" C " Cloudy. 



« " R " Eain. 



« " S " Snow. 



" " — " Below zero. 



VOL. VI. NEW SERIES. 31 



