| 摘要 |
The invention consists of a hopper to place material in, and a door beneath it to hold back the material until it is to be released onto a grid consisting of four separate compartments or chutes that direct the material into four separate sample containers. The latch is arranged in such a manner as to allow the gates to open suddenly, and simultaneously, releasing the material in a mass (rather than slowly), assuring an even flow of the material down the chutes and into the four waiting containers below. This assures an unbiased sample in each container. For further reductions in sample size, the common practice is to choose any two opposite corner containers, combine in the hopper and repeat the process.
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