Measurement of Weight 



59 



the weight of which lies between 9' 97 and 10' 01 g., 

 would not be considered to require re-graduation. 



Similarly test the accuracy of graduation in the case 

 of 5 c.c., 20 c.c., 25 c.c. , and 50 c.c. pipettes. 



Fig. 22. 



EXPERIMENT 18. To check the accuracy of gradua- 

 tion of a burette, counterpoise a beaker sufficiently 

 large to hold all the liquid in the burette. Fill the 

 burette with distilled water till the water-level is above 

 the zero mark, open the tap and allow water to run out 

 till the lower edge of the meniscus just reaches the 



