The Different Connection Of Particles
: STORIES FROM PHYSICS
: Fables For Children, Stories For Children, Natural Science Stori
Why are cart bolsters cut and wheel naves turned not from oak, but from
birch? Bolsters and naves have to be strong, and oak is not more
expensive than birch.
Because oak splits lengthwise, and birch does not split, but ravels out.
Because, though oak is more firmly connected than birch, it is connected
in such a way that it splits lengthwise, while birch does not.
Why are wheels and runners bent from oak and elm, and not from birch and
Because, when oak and elm are steamed in a bath, they bend and do not
break, while birch and linden ravel in every direction.
This is again for the same reason, that is, that the particles of the
wood in the oak and in the birch are differently connected.