. Bulletin of the Department of Agriculture. Agriculture; Agriculture. TEST WEIGHT OF GEAIN : ACCUEACY OF TESTING APPARATUS. 11 METHOD OF DETERMINING ACCURACY AND SENSITIVENESS OF BEAM. Before attempting to check the accuracy of the beam the base of the tester should be leveled and, if it is of the standard type with horizontal arm and trig loop, this level should be tested by examin- ing the position of the projection or pointer on the end of the beam in its relation to the trig loop. The pointer should be in the center of the trig loop both horizontally and vertically when the empty ket
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. TEST WEIGHT OF GEAIN : ACCUEACY OF TESTING APPARATUS. 11 METHOD OF DETERMINING ACCURACY AND SENSITIVENESS OF BEAM. Before attempting to check the accuracy of the beam the base of the tester should be leveled and, if it is of the standard type with horizontal arm and trig loop, this level should be tested by examin- ing the position of the projection or pointer on the end of the beam in its relation to the trig loop. The pointer should be in the center of the trig loop both horizontally and vertically when the empty kettle is on the beam and the counterpoises are at zero. If this is not the case the leveling screws should be adjusted until it is true. There are two methods of checking the accuracy of the beam graduations. In the more simple and direct method a special set of 14 accurate testing weights is used while in the other method an ordinary set of metric weights is Fig. 8.—Special weights used in determining the accuracy of the beam in the weight- per-bushel testing apparatus. In making the test these weights are placed in the test kettle. The 14 special weights illustrated in figure 8 are marked to repre- sent the following number of pounds per bushel: 60, 50, 40, 30, 20, 10, 5, 2, 2, 1, , , and Each weight actually weighs ^ of its marked value. To test the beam place any weight or combina- tion of weights, within the range of the beam graduations, in the kettle and bring the beam to balance by means of the counterpoise. The combined readings of the counterpoises should now equal the combined represented weights in the kettle, and the difference be- tween the weight represented in the kettle and on the beams, if any, i- the error of the beam. It is equally essential in making correct weight-per-bushe] tests, especially on •• line " samples, thai (lie beam should not only indicate an apparently correct reading when a given weight is placed ill the test kett
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