Western Australian Current Regulations Western Australian Current Regulations (1) The method by
which it is ascertained that smoke is dark smoke is by the use of a Ringelmann
Chart or Miniature Ringelmann Chart.
(2) The chart is to be
held or fixed in a position facing the observer and is to be in line with the
observer and the source under observation.
(3) The darkness of
the air impurities at the point where they leave the source is to be compared
with the shades on the chart.
(4) The shade which
most closely matches the darkness of the air impurities and the time of the
duration of this shade are to be noted.
(5) As far as
practicable, when observations are made with the sun shining, the position of
the observer and the chart is to be such that the sun, chart and observer form
a right angle.
(6) When the
Ringelmann Chart is used, the observer is to be 15 to 30 metres from the chart
and when the Miniature Ringelmann Chart is used, the observer is to be 1 to 5
metres from the chart.
(7) The Ringelmann
Chart and Miniature Ringelmann Chart used for making the measurements
described in this regulation shall correspond to charts held by the Minister
certified as the standard charts under the signature of the Minister.
[Regulation 5 amended: Gazette
21 Jun 1985 p. 2202.]