Adjudicatory authority expanded to include the Board, amending statutory phrasing and removing a possessive wording in the text. The amendment inserts 'or the Board' after each occurrence of the phrase adjudicating officer in section 24 of the principal Act, adding the Board as an alternative named actor in those provisions, and deletes the words 'of his' from sub section (2), thereby removing that possessive expression from the subsection's text.