The sources
The Norwegian Rune Poem
Ole Worm printed this poem in runic characters in his Danica Literatura Antiquissima at Amsterdam in 1636, from a law manuscript in the University Library at Copenhagen. That manuscript perished in the fire of 1728. It had been copied later in the seventeenth century by Árni Magnússon and by Jón Eggertsson, and those transcripts, which Dickins calls far more accurate than Worm’s own reading, survive at Copenhagen and at Stockholm. Kálund built his critical text on them and Dickins built his on Kálund.
The poem is Norwegian and not Icelandic, and one dropped letter proves it. In the stanza for Raidho, reið and rossom alliterate. With the Icelandic form of the same word, hrossum, they would not. That is how we know which country the poem is from.
The form is six-syllable couplets. The first line carries two alliterating words and is joined to the second by end-rhyme and by enjambement, and the second line has no alliteration of its own. Dickins describes each couplet as two semi-detached statements of a gnomic character.
That description is the whole reason this site prints a note in the Norwegian block on every rune page. A wolf under Fehu, Reginn under Raidho, Christ under Hagalaz, Loki under Berkano: the second line is where the rhyme lands, and often that is the strongest thing connecting it to the first.