| 摘要 |
A periscope (10) of the present invention is adapted to allow a farmer to monitor the inside of a wagon (18) while it is being filled with grain (20) from a grain cart (14). In this way, the farmer will know when the wagon (18) is fu ll and can prevent the wagon (18) from overfilling and spilling grain (20). The top mirror (30) of the periscope (10) is convex in shape and can be adjusted to change the field of view.
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