The Atlas Powder Company, it seems, supplied high explosives. But for a real blast, only this Atlas will do:
This is the old Signet edition - the one I read back in the early 1970s (though not that particular copy, which disintegrated long ago). Apart from the sentimental value, it's much more attractive than the latest Penguin edition with the hideous Tamara de Lempicka painting on the cover.