Filter/dilution tunnel. A smoke sample is drawn by way of a tube where by it is diluted with air, the resulting smoke/air mixture is then pulled via a filter and weighed. This is the internationally acknowledged means of measuring smoke from combustion.[66] The 19th century witnessed various sizeable developments https://reidlymzl.mysticwiki.com/1399855/helping_the_others_realize_the_advantages_of_smoke