Encara no tenim significats per a "heavy peal".
1Here another long and heavy peal, like thunder, began to be heard.
2A heavy peal of thunder followed very quickly.
3There had, for a little while past, been a low growling and muttering, which all at once broke into a heavy peal of thunder.
4From these threatening masses, seamed at intervals with pale lightning, there now burst a heavy peal of thunder that shook the ground under our feet.
5In their march, across the level prairie of this high table-land, they encountered a squall of rain, with vivid lightning and heavy peals of thunder.
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