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Ringelmann smoke charts, 1897. The Ringelmann scale is a scale for measuring the apparent density or opacity of smoke. [1] [2] It was developed by a French professor of agricultural engineering Maximilien Ringelmann of La Station d'Essais de Machines in Paris, who first specified the scale in 1888. [3] [4]
Smoke-developed index (abbreviated SDI) is a measure of the concentration of smoke a material emits as it burns. [1] Like the Flame Spread Index, it is based on an arbitrary scale in which asbestos-cement board has a value of 0, and red oak wood has 100. The SDI is measured using a horizontal test specimen, according to the Steiner tunnel test ...
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An ASTM Smoke Pump, or 'spot pump', is an instrument for evaluating the dark particle concentration of a smoke. It is very widely used (2014) by heating engineers to assess emissions , most commonly from fuel -burning appliances such as a wood stoves or oil boilers .
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JPM predicts that the US will continue to lead by market cap share in 2037 as artificial intelligence benefits expand beyond a few large tech names that have dominated the market rally.
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