Breathing dust that contains respirable crystalline silica can lead to silicosis, a deadly lung disease. Respirable dust is that fraction of the aerosol that is small enough to reach the deeper, gas-exchange regions of the lungs. No effective treatment exists for silicosis, but it can be prevented by controlling workers’ exposures to dust containing crystalline silica. Exposure to crystalline s...

High pressure waterjets are now entering use on an increasing scale for primary rock excavation in quarries. In order to assess the parameters required for any such rock cutting operation a series of experiments need to be carried out in which the critical operational parameters are identified. This paper seeks to identify such a standard procedure with an explanation with the reasons for choic...