Thanks Glen, more generally, do we know the levels of literacy at those times ? Might simply be prescribing that each lodge have a man to record the doings of the lodge ? I've never considered it before, but if literacy among operatives was low, admitting non-freemasons who could write might have been a useful resource .. I also note in your link "The administration of oaths has always been an important function of the notary."
In the 2nd Schaw Statutes
(8) The warden and deacon, together with the masters of the district
[quarter maisteries
] shall elect a well known notary
[constitut ane famous notar
] as clerk and secretary
[scryb
] who shall make out and sign all indentures, discharges, and other writings whatsoever, pertaining to the craft, and no writ, title or other evidence shall be admitted by the warden and deacon, except it shall have been executed by this clerk and signed by him.
http://www.themasonictrowel.com/Articles/Manuscripts/manuscripts/shaw_statutes/shaw_statutes.htm