3. Every coroner who is unable or expects to become unable to act may, by a writing over his signature, delegate his powers in any part of the territory for which he was appointed and for which no coroner or deputy coroner is competent to act, to a coroner of an adjoining territory.
The writing shall specify the investigations or inquests for which such powers are delegated, or indicate the period for which the delegation is valid.
A duplicate of the written delegation shall be transmitted forthwith to the clerk of the peace of the judicial district in which the coroner who delegates his duties is competent to act.