648 



PHYSICAL PROPERTIES OF ICE. 



Monthly Measurements of Ice and Snow. 



Date. 



Ice 

 Thickness. 



Increase 

 during 

 Month. 



Snow 

 Thickness. 



1857. October 16 - 



jSTovember 16 - 



December 16 - 



1858. January 16 - 



February 16 - 



March 16 



April 16 - 



ft. in. 



1 3| 



2 01 



3 



3 7^ 



3 9 



4 2,\ 



3 1 



ft. in. 



si 



IH 



n 



6i 



decrease 



1-2^ 



m. 

 ih 

 5| 

 Ci 

 8-i 

 9i 

 9i 



101 



Increase 

 during 

 Month. 



Small Measurements of Increase of Ice. 





Hours. 



Thickness. 



Temperature. 









in. 









3 



i 



-29° 







6 



1-i 



-26 







18 



3«^ 



-25 







24 



3i 



-22-5 





No. 4. 



Number of 



Hours Temperature.' 

 in forming. | 



Specific 

 Gravity, 



Efflorescence 



24 



1-0375 (70 

 1-0410 (44 

 1-0495 (34 

 1-0625 (45 

 1-0650 (28 ) 

 1-0665 (40 ) 

 1-0710 (30 ) 

 1*0945 (30 ) 

 1-0775 (28 ) 

 1-0880 (30 ) 







T)afp 







Ice formed (3 inches thick) at 



Specific 









Temperature of +25. 



Gravity. 



1857. 



September 7 and 8 









1-0235 (26°) 



1858. 



January 15 







Same ice, upper 3 inches - 



1-0102 (29 ) 



-— 



March 22 







„ to 6 inches from surface - 



1-0078 (30 ) 

 1-0065 (35 ) 



„ 



„ 







6 to 12 



> „ 





, 



J, 







12 to 18 



) « 



1-0052 (32 ) 





, 









18 to 24 



J j> 



1-0050 (30 ) 





, 









24 to 30 



, >, 



1-0050 (30 ) 

 1-0058 (32 ) 





, 



M 







30 to 36 



. 





, 









36 to 42 



, „ 



1-0055 (30 





, 









42 to 48 



, „ 



1-0050 (32 1 



> 



' 



:5 - 





48 to 54 



, 



1-0050 (35 ) 











Total depth, 4 feet 6 inches. 





