236 



Domestic Science 



drawing a short pencilled line on the paper at the 

 water-level. Leave the beaker exposed to the air for 

 a day in a part of the room as free from draughts as 

 possible. At the end of that time again mark the 

 water-level and weigh the beaker and water. Repeat 

 this daily for several days. 



An instructive method of recording the observations 

 made so that they may be readily compared, is that of 



5-0 



4-5 

 4-0 

 3-5 

 3-0 

 2-5 

 2-0 

 1-5 

 1-0 

 0-5 



1 2 3456 7 8 9101112 

 Fig. 75. 



plotting the values on squared paper. The plotting is 

 performed as follows : 



On a sheet of squared paper draw horizontal and 

 vertical lines intersecting at 0, as shown in Fig. 75, 

 Along the horizontal line mark off a scale of time, 

 starting from 0, the consecutive numbers on this scale 

 representing the numbers of days since commencing 



