Measurement of Length 9 



Similarly took readings, using the edge of the scale 

 graduated in centimetres. 



Method of Graduation. Cross section of scale. 



Fig. 3. 



Estimated hundredths of an inch and tenths of a 

 millimetre by eye. The readings and results are given 

 below. 



Number of 

 measurement 



Reading on 

 scale at A 



Reading on 

 scale at B 



Length of 

 AB 



Results. Mean value of the length of AB in inches 



3-74 + 3-75 + 3-74 

 = - =3'74... inches. 



Mean value of the length of AB in centimetres 

 9'50 + 9^53 + 9-51 

 3 



= 9*51 ... centimetres. 



Hence the number of centimetres in one inch 

 9-51 



3-74 



-2-54.. 



