Study Figure and state which of the fourteen days 

 was the warmest and which was the coldest. 



365 



55 



50 



45 



40 



12 84 607 8 9 10 11 1318 14 



Days 



FIG. 5. A temperature curve for a fortnight. 



EXPERIMENT 3. COEFFICIENT OF EXPANSION OF A SOLID 



Inclose an iron rod in a tube, allowing it to project about 

 one eighth of an inch beyond the corks which close in 

 the ends of the tube. Attach the tube, as shown in Fig- 

 ure 6, to a steam boiler containing cold water and close the 

 opening O of the tube by means of a cork into which a 

 thermometer is inserted. Note and record the reading of 

 the thermometer. At the same time, with the aid of two 



