The township supervisors may hire such help as may be necessary by the hour at such rates as may be agreed upon by the township board of supervisors. Source: SL 1911, ch 221 , § 4; SL 1913, ch 232 , § 2; SL 1917, ch 369 , § 1; RC 1919, § 8552; SDC 1939, § 28.0405; SL 1953, ch 146 , § 2.