I have read that first publications of Old-Scripts were altered so
the
text would appear in likeness of "Old-Norse".
"Old-Norse" then term of supposed old language (Icelandic) forwarded
from the pioniers of modern Linguistics.
So we can find lot of modern publication written the Old-Norse way
but
very few or any original manuscripts.
Publications by "Bjarni Guðnason" are said to be more loyal to
scripts than for exampel those of "Finnur Jónsson".
I my self, after several years of reading the tree principal and
medieval descriptions of Icelandic Morphology, am sure that "Norræna"
by my ancestors refers to conventual Orthography.
Orthography in likeness of those in many contries apt to alter the
tongue of the upper classes.
"The limbs dance by the Head" we say.
The Z were used for short writing of -ðs,-ds, -ts, that is
corresponding gentives of the dental runes "Leitar": eð, (eðð=eth),
et, edd, ett.
In modern Icelandic the "z" was dismissed but "s" or "ss" put in
stead.
But my forfathers before put tt for ght, and ll for dl and rn for rd
just to
hide the Morphological structure of Icelandic [from aliens I reckon.
Thanks Uoden
Kirk and Kyrk have literary different meanings here. What about
sound meaning. It is difficult to utter when someone is trying to
stifle you.