II 



the first temperature was taken. On the assumption 

 that the temperature rises i every five minutes, find the 

 points representing ten five : minute intervals and their 

 corresponding temperatures. With a sharp pencil draw 



FlG. 4. Each space above CUf represents one degree 

 of temperature ; each space to the right of OY repre- 

 sents 5 minutes of time. 



a smooth line through these plotted points. Such a line is 

 called the temperature curve or the temperature graph. 



Note and record the thermometer reading at a given place 

 at the same time each day for a fortnight. Be careful to 

 have the thermometer free from drafts and out of the direct 

 sunlight. 



Draw a curve which will show temperature changes for 

 the fortnight, using distances above OX to denote temper- 

 atures, and distances to the right of OY to denote their 

 corresponding dates. 



