8 Domestic Science 



As an interesting exercise, calculate, from the 

 mean results obtained, the number of centimetres in 

 one inch by dividing the length of AB in centimetres 

 by its length in inches, and vice versa, the number of 

 inches in one centimetre. The degree of correctness 

 of the results thus calculated will afford a measure of 

 the accuracy with which the length AB has been 

 determined. 



9. This simple experiment has been very fully 

 described in order that the student may clearly under- 

 stand how an experiment which is to yield satisfactory 

 and accurate results is to be carried out. An account 

 of what is done should be written out in a manuscript 

 book, and the following is suggested as a suitable 

 method of entry : 



M. JONES. 18 . 7 . '14. 



EXPERIMENT 1. 



Object. To measure the distance between two points 

 in inches and in centimetres, and to find 



(a) the number of centimetres in an inch ; 

 (6) the number of inches in a centimetre. 



Apparatus. A boxwood scale, of which the method 

 of graduation and the cross section are shown in the 

 diagram. 



Method and Observations. Marked two small dots 

 on the sheet of paper provided. Placed the end mark 

 of the scale so that it coincided as closely as possible 

 with one dot and adjusted till the other dot was just 

 touching the edge of the scale. Took the readings on 

 the scale opposite each dot. 



Repeated this operation twice with the dots 

 opposite different graduations on the scale. 



