Nothing in this chapter shall be construed to apply to the position of private secretary or deputy of any official or department, or to any person holding a strictly confidential relation to the appointing officer. [S13, §1056-a16; C24, 27, 31, 35, 39, § 1165; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §70.8 ] C93, §35C.8