BSI - BS 2742
Notes of the use of Ringelmann and miniature smoke charts. The calibration of instruments in Ringelmann number
|Publication Date:||27 June 1972|
|ICS Code (Chimneys, shafts, ducts):||91.060.40|
|ICS Code (Stationary source emissions):||13.040.40|
Provides a relationship for the conversion of measurements of optical density of smoke to 'standard' Ringelmann numbers.