12 BULLETIN 1065, U. S. DEPARTMENT OE AGRICULTURE. 



tester having a trig loop the beam should move from the center posi- 

 tion to either the top or the bottom of the trig loop whenever the 

 poise on the beam is shifted one-tenth pound under or over the cor- 

 rect position for the load that is being weighed in the test kettle. 

 Beams are occasionally found in use which are " slow " and which 

 do not show a change in the beam reading until the poise is moved 

 along the beam often to the extent of an indicated half pound or 

 more per bushel. 



In testing the beam by the second method, an accurate set of 

 ordinary metric weights, comprising weights from 1,000 grams to 

 0.1 gram, is used. However, if 0.1 gram weights are not available, 

 1 gram weights may be used to check to within one-tenth of a pound 

 per bushel. 



The table of equivalents (Table 2) has been prepared to facilitate 

 the use of metric weights for checking beams. 



HOW TO USE THE TABLE OF EQUIVALENTS. 



It must be remembered that the pounds per bushel in the table are 

 shown on the beam of the tester, and that the equivalent grams per 

 quart in the table are to be placed in the kettle. The first column 

 in the table contains the even pounds per bushel and the second 

 column headed " 0.0 " (tenths) contains the grams-per-quart equiva- 

 lent. The third column headed " 0.1 " contains the grams-per-quart 

 equivalent to the pounds per bushel horizontally opposite any gram 

 figures plus 0.1, or in the last column headed " 0.9 " the figures in 

 grams horizontally opposite to any pounds per bushel in the first 

 column represent that number of pounds plus " 0.9." 



Example: How many grams per quart are equivalent to 50.9 

 pounds per bushel? 



Follow down the left-hand column of the table to 50.0, then on that 

 line horizontally to the right to the column headed 0.9 and find 721.5 

 grams, which if placed in the kettle should balance 50.9 pounds per 

 bushel on the beam. 



If it is practicable to determine the weight in grams of the con- 

 tents of a quart test kettle, this weight per quart in grams may be 

 transposed by the use of the table to pounds per bushel. 



Example: If 1 quart of grain is found to weigh 781 grams, what 

 is the weight per bushel? 



Find 781.0 grams in the column headed 0.1. It is horizontally 

 opposite 55.0 ; therefore, 781.0 grams per quart is equivalent to 55.1 

 pounds per bushel. 



