TEST WEIGHT OF GRAIN I ACCURACY OF TESTING APPARATUS. 9 
3. A correct even-arm balance. 
4. One standard weight weighing 1,098.08 grams, or standard 
weights from which this amount can be built up. 
5. One tolerance weight (1 gram). 
6. A supply of distilled or pure water. 
7. A chemical thermometer reading 20° C. or 68° F. 
To make the test : 
1. Remove scoop from balance and place the test kettle, slicker 
plate, and standard weight on scoop bracket and bring the scale to 
exact balance by means of weights and sliding poise, as shown in 
figure 7. 
Fig. 6. — Special apparatus consisting of a metal weight weighing 1,098.08 grams, glass, 
slicker plate, and a 1-gram tolerance weight used in connection with a sensitive even- 
arm balance for determining the accuracy of quart weight-per-bushel testing kettles. 
2. Remove kettle, slicker plate, and standard weight from one arm 
of the balance, being careful to avoid disturbing the weights or coun- 
terpoise on the other arm of the balance. Fill the kettle full to over- 
flowing with distilled water which has been brought to the required 
temperature of 20° C. or 68° F. and place slicker plate on top of 
kettle to remove excess water, leaving the kettle exactly level full. 
The purpose of this action is similar to that of "striking-off" the 
excess grain in a test kettle when making a weight-per-bushel test. 
To eliminate all air bubbles from beneath the plate and the inside 
of the kettle it may be necessary to repeat this operation several 
times, refilling the kettle each time. When there are no air bubbles 
in the kettle carefully wipe off all moisture on outside and bottom 
of kettle. 
