12 DEPARTMENT BULLETIN 12 16, U. S. DEPT. OF AGRICULTURE 
to a position of equilibrium at the top of the trig loop) shall not exceed 1 
pound at the full capacity of the machine or at any lesser load. The clips 
for holding the tension test specimens shall be in accordance with Figure 6. 
The bearing surfaces of the clips and briquets shall be free from sand or dirt, 
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and the roller bearings shall be well oiled and maintained so as to insure 
freedom of turning. The briquets shall be carefully centered in the clips and 
the load applied continuously at the rate of 600 pounds per minute. 
53. Testing machines shall be frequently calibrated in order to determine their 
accuracy. 
