Schematic of Swedish apparatus. ... The dosage valve stems are moved forward to deliver this flow to the main airstream by compressed air-operated pistons or are retracted by the pistons to deliver the odorant flow to an exhaust channel.
|Title||:||Air Pollution: Measuring, monitoring, and surveillance of air pollution|
|Author||:||Arthur C. Stern|
|Publisher||:||Academic Pr - 1976|