comparision- Foghorns and The Forn Horn

Both of the peoms are about foghorns and the horrible and loud noise that they make. In the first peom, 'the foghorn moaning' and in the second peom, 'for horn/ Calls, like a cow in pain'. In the second poem this similie is there to make it easier for people to understand and picture. We can all imagine that sound and it makes. So in both cases the foghorn is describled as moaning and loud sound.