Background

 The existence of an untrimmed grain surface within a filled compartment, as permitted when a dispensation from trimming has been granted, raises a question as to the angle of the surface after a grain shift has occurred. Part B, section I(A)(a)(ii), states that the untrimmed surface before the shift will be at an angle of 30°. Also, part B, section IV(A), states that, after shift, the surface shall be assumed to be at an angle of 25°. But for any part of the surface to change its angle from 30° before shifting to 25° after shifting implies that the grain, in that part, has moved against gravity, i.e. “uphill". The sketches below illustrate the question. Figure 5 is the alternative where part of the surface remains at 30° after shift and the remainder is at 25°-there is no “uphill" movement of the grain. Figure 6 is the alternative where the entire shifted surface is at 25°, implying that some of the grain has moved “uphill". It is to be noted that the latter alternative is the assumption which is mandated by the regulations. The following guideline is directed at emphasizing this intent of the regulation.