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प्रश्न
How the iron blade is fixed into a wooden handle in tools used to dig the soil?
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उत्तर
- First the ring in the iron blade of spade is heated.
- Heating of the blade leads to its expansion and thus the ring gets bigger.
- This happens because metals always expand on heating.
- The metal blade is then fitted easily into the wooden handle.
- After this, cold water is usually poured on the iron blade which leads to the contraction of the expanded iron blade.
- The spade can also be left to cool down, undisturbed so that it is firmly fixed, (vu) The blade is attached firmly to the wooden handle of a spade in this process.
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