Requirements of construction and operation of instruments designed to measure the optical density of or percentage obscuration caused by smoke emitted from chimneys.Cross References:BS 89BS 90BS 2643BS 2740BS 2741BS 2742Addendum No. 1 to BS 2742:1969Clean Air Act
Original price was: $160.02.$80.00Current price is: $80.00.
Specification for smoke density indicators and recorders
BSI Group , 12/31/1969
Pages: 14
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