READING TEST BOTTLES. 



301 



the curvature at the bottom of the fat column — d, c. 

 The meniscus occupies .4 per cent on the reading. 

 This bottle, due to the small size of the meniscus, is 

 the best bottle for the inexperienced creameryman. 

 Even if the dividers should slip a little, the error 

 arising from this would not be great, because the 

 graduation is in .2 per cent, and 1 per cent on the 

 graduation takes up quite a space on the bottle. By 

 v^reighing out 9 grams into bottle shown in Fig. III. 

 a,n error made is increased by two, and when an 

 error is made in reading the test of the sample the 

 error made in weighing is multiplied by 4. 



80. Comparing a. 9 gram Fig.' IV., 50 per cent 

 cream test bottle with an 18 gram, 30 per cent cream 

 test bottle, Fig. II. The 30 per cent, 9 inch cream 

 bottle. Fig. II., is graduated into .2 per cent, while 

 the 50 per cent, 6 inch bottle. Fig. III., is graduated 



Fig I. 



into .5 per cent. The meniscus of the bottle. Fig. 

 Ill, is about 1.8 per cent. Reading this bottle from 

 the extreme bottom to the extreme top, the reading 

 is about 2 per cent too high, as compared with Fig. 

 II, the reading of which is about .3 per cent too high. 



