Experience soon taught what kind of vessels coped best with ice, and at the turn of the 20th century, certain fundamental designs had already been established.
Peagi õpiti kogemuste kaudu, millised laevad saavad jääga kõige paremini hakkama, nii et 20. sajandi hakuks olid juba kasutusel kindlakskujunenud konstruktsioonielemendid.