In this Act unless the context otherwise requires—

The expression “police authority” means in the acse of the Royal Irish Constabulary the Inspector-General, and in the case of the Dublin Metropolitan Police the Chief Commissioner; and

The expression “constable” includes any head constable major, head constable, sergeant, acting sergeant and constable of the Royal Irish Constabulary, and any member of the Dublin Metropolitan Police not being of higher rank than chief superintendent.