THE NORMAL ADVANCE13anvil to cool. Soon, a strange buzzing soundwas heard in that direction, which was tracedto the hot silver, quivering upon...
that in cooling it contracted
after a time a thin cooled crust wasformed
the contracting center pulled awayfrom this, thus causing it to fold and wrinkle,forming ridges and folds, from which mountains, gorges, hills an...
its surface had remained rigid
instead of diversity and grandeur of scenery—instead of mountain and valley, hill and graceful slope, there had been onedreary monotonous, unin...
or the Prince Rupertdrop, the breaking off the tail of which explodes it into dust. Wheelwrights use theprinciple of contraction in setting ...
if allowed tocontract, it produces cold instead of heat. Heatapplied to India-rubber contracts it
cold expands it. This is merely one of Natures littlesurprises.We have next to consider the expansion ofliquids. A common experiment is to h...