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Did older Icelandic use any apostrophes?  Representing what?

I am generally unfamiliar with any use of apostrophes in Icelandic, current or older.
However, I just discovered a punctuation mark similar to an apostrophe in quite a few places in [this 100 years old article](https://timarit.is/page/1122930?iabr=on#page/n1/mode/2up). Those occurrences are mostly found in the right hand side, bottom part of the printed page, and they include the following:
> Ég vissi´ ekki hvar[...]
> [...]örninn uppi´ á hamrinu[...]
> Það tjáir ekki´ að flýja[...]
~~(The text can be zoomed into using ctrl + mouse click for a closer look.)~~
The apostrophe only ever occurs at the end of a word, following a final "i", and before a word starting with a vowel. However, the same context may also appear without the apostrophe:
> Stella ætlaði ekki að hreyfa sig,[...]
(to be found in the middle column of the same article)
What does the apostrophe stand for?

I am generally unfamiliar with any use of apostrophes in Icelandic, current or older.
However, I just discovered a punctuation mark similar to an apostrophe in quite a few places in [this 100 years old article](https://timarit.is/page/1122930?iabr=on#page/n1/mode/2up). Those occurrences are mostly found in the right hand side, bottom part of the printed page, and they include the following:
> Ég vissi´ ekki hvar[...]
> [...]örninn uppi´ á hamrinu[...]
> Það tjáir ekki´ að flýja[...]
The apostrophe only ever occurs at the end of a word, following a final "i", and before a word starting with a vowel. However, the same context may also appear without the apostrophe:
> Stella ætlaði ekki að hreyfa sig,[...]
(to be found in the middle column of the same article)
What does the apostrophe stand for?

orthography Icelandic