11-20-020 Apparatus for testing purity.
   All tests to be made for the purpose of establishing the percentage of sulphurated hydrogen in illuminating gas furnished by any person furnishing gas in the city, shall be made or conducted with the Tutweiler sulphurated hydrogen apparatus, and the sulphur in other forms shall be determined by means of the gas referees' sulphur-determining apparatus and methods ordinarily employed in the use of the same.
(Prior code § 187-2)