12 BULLETIN 106-5, 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 n 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 50.0 
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. 
Era in pie: 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. T81.0 grams per quart is equivalent to 55.1 
pounds per bushel. 
