8 BULLETIN 374, U. S. DEPAKTMENT OF AGEICULTUE.E. 



The formula for finding the percentage of shrinkage corresponding 

 to anv reduction in moisture content is as follows : 



/fPercentage oh fPercentage ot'i \ 



-I I dry matters : I dry matter > :: 100 : x )= 



\[ after drjdngj I before drjdngJ / 



Example. — Find the percentage of shiinkage wlien wheat has been dried from 18 

 per cent moisture content to 12 per cent moisture content. 



Solution: 100-(88 : 82 :: 100 : r/;) = (100-93.18), which equals 6.82. 



In this case the moisture content was reduced by 6 per cent and 

 the shrinkage in weight was 6.82 per cent. 



When the original weight and the moisture content before and 

 after drying are kno^Ti and it is desired to find the final weight, or, 

 in other words, the weight of the dried material, it can be obtained 

 by the formula — 



Percentage of"! fPercentage ofi ,^ . . ,^ , -„. , 

 dry matter : dry matter :: |0"?"^^^1 : | ^^lal 

 after dr;.ingj I before drjingj ^ weight. J Weight. 



Example. — If 2,000 pounds of grain containing 18 per cent of moisture has been dried 

 and the grain tested 12 per cent of moisture after drjdng, what is the weight of the 

 grain after dr jdng? 



Applying the above formula gives — 



(88 : 82 :: 2,000 : .-c) = (164000^88), which equals 1,863.6. 



Therefore, the grain after drying weighed 1,863.6 pounds. 



EXPLANATION OF TABLES. 



Table I shows the percentage of shrinkage in weight correspond- 

 ing to definite reductions in the moisture content. 



Tables II to XII, inclusive, show the comparative values on a dry- 

 matter basis of grain, cottonseed, and other products containing 

 various percentages of moisture. 



Tables II to IX, inclusive, are appHcable to all grains, cottonseed, 

 flour, and similar products, and give the comparative values for the 

 dry matter in a unit containing from 10 to 24 per cent of moisture. 

 These tables are based on even money for the units containmg 10 to 

 17 per cent of moisture, respectively. 



Tables X and XI are more particularly applicable to shelled corn 

 and give the comparative values for the dry matter in a unit con- 

 taining from 12 to 24 per cent of moisture. These tables are based 

 on even money for units containing the maximum moisture allowed 

 in the Government grades for Xo. 2 and No. 3 com, respectively. 



Table XII gives the comparative values, by grades, of a unit of 

 com containing the maximum moisture allowed in each of the six 

 numerical grades estabhshed by the Government. 



Tables snowing the comparative values of a unit of weight of grain 

 on a dr5-matter basis when applied to com are applicable to sheUed 

 com only. In ear com, the cobs at the time of harvest test higher 

 in moisture than the kernels, but dui'ing storage the cobs dry out 

 faster than the kernels and contain less moisture than the kernels 

 when the com is in an air-dry condition. 



