Grave and acute

My friend John Cowan just asked me "Do you know the history of Gaelic grave vs. Irish acute?"

Of course Irish uses áéíóú. And Scottish Gaelic uses àèìòù. I've never thought about this. I'll have to look into it.

The earliest printed book in Irish uses the acute. To me that seems a natural choice. I don't know why people setting Scottish Gaelic chose the grave though. I'll look into it.