74 LABORATORY LESSONS IN GENERAL SCIENCE 



FEB. 19,1893 ITHACA 



FIG. 33. Range in temperature dur- 

 ing twenty-four hours. 



7. Attempt an explana- 

 tion of the fact that the 

 highest temperature of the 

 day comes later than noon, 

 which is the time of great- 

 est solar heating. 1 



8. Why is it warmer at 

 sunset than at sunrise ? 



9. Why is it that in 

 northern latitudes the 

 coldest weather is likely 

 to be in January and 

 February rather than in 

 December ? 



FEB. MAR. APR. MAY JUNE JUL* AUG. SEPT OC 



X 



,-o-qgdfe^^i:--^ 

 >-"o?( _ ^^ 



2. 





x 



x 



FIG. 34. Range of temperature during a 

 year for five places having very differ- 

 ent climatic conditions. The influence of 

 the oceanic waters of the Tropics is seen 

 in 4 and 5. 



1 It may be possible to make more clear the cumulative heating by day, 

 and throughout a summer, by use of several dishes of different capacity 

 and a vessel of water. The gain and the loss of heat per hour at the place 

 where the observer is stationed on the earth may be represented by quanti- 

 ties of water added to or taken from an original volume in the vessel. The 

 hourly losses by radiation from the earth through a 24-hour period may be 

 considered as approximately the same' for any observer. The gain in heat 

 per hour increases up to noon, and then decreases, although for some time 

 after the noon hour the gai^n per hour exceeds the loss. 



