.........Off topic. Linden, you mention graphatactics and accent-like marks. Have you any idea what they're for? I did a search on Prof. Robert Stevick and not much came up. Those accent like marks seem to be used pretty randomly.
Yes - they do look random which is why I got interested in them whilst working on the Exeter Book riddles. Regarding the "accent" marks, they cannot be indications of long vowels as they (i) occur on only a few long vowels and (ii) occur on at least one short vowel. The capitalisation is interesting too and does not always coincide with the start of a half-line. I have some leads and ideas and "I'm working on it" but unless and until I can get to see the Exeter Book itself or a facsimile thereof, I'm having to work with the various editors' reports of how the riddles actually appear in the manuscript. These other textual differences only came to my attention when I realised that the riddle texts as they appear in various publications and on the 'net are not exactly the same as the texts in the Exeter Book manuscript. The word themselves have occasionally been 'corrected', replaced and inserted according to the various editor's interpretations. By using a combination of Wyatt, Krapp& Dobbie, Tupper and Williamson I am managing to put together a rough representation of the written bits including punctuation, accents and capitalisation but comparative spacing is something that none of them cover.
Regarding Robert Stevick, his PhD is of 1950's vintage so looking him up on the Internet does not yield very much. His publications include:-
Date N/K A Firstbook of Old English
1964 One Hundred Middle English Lyrics
1967 Five Middle English Narratives
1968 Suprasegmentals, Meter, and the Manuscript of Beowulf.
1968 English and Its History : The Evolution of a Language
1975 Beowulf: With Manuscript Spacing, Notation & Graphotactic Analyses
1994 The Earliest Irish and English Book Arts: Visual and Poetic Forms Before A.D.1000