Abstract
Authors made a wire strain gauge by themselves and practised measurements on the stress of a plow and a cultivator with it, gaining the following results.
1. Calculating formula of curved beam is more reasonable than that of usual beam for application to the tested cultivator-shank.
2. The total draft of cultivator acts through the hitch-point.
3. A group of principal stress lines on moldboard runs along the trace of movement of furrow-slice.
It seems to be certain that the further investigation. should be claimed for these tests, due to a defect of the meter, but anthers could measured rather easily and could have the hope to use it for many researches on the farm machinery.
