. Biology and human life. Biology. INDUSTRIAL PROBLEMS OF HEALTH 383 In polishing furniture powdered pumice stone and oil can be used instead of sandpaper. In some dusty processes the machinery and the material are inclosed in such a way as to prevent the escape of dust into the air breathed by the workers — for example, in flour mills, in the crushing of ores and minerals, and in the polishing of small metal Fig. 168. Dust and safety hood In polishing metal goods this hood protects the worker from dust and, in case the wheel bursts, from flying particles. (From a photograph furnishe


. Biology and human life. Biology. INDUSTRIAL PROBLEMS OF HEALTH 383 In polishing furniture powdered pumice stone and oil can be used instead of sandpaper. In some dusty processes the machinery and the material are inclosed in such a way as to prevent the escape of dust into the air breathed by the workers — for example, in flour mills, in the crushing of ores and minerals, and in the polishing of small metal Fig. 168. Dust and safety hood In polishing metal goods this hood protects the worker from dust and, in case the wheel bursts, from flying particles. (From a photograph furnished by the New Jersey Department of Labor) In grinding paints or metals it is possible in many cases to use a wet process, in which water or oil holds down the dust particles resulting from the grinding. Where it is not practicable to keep down the dust in the proc- ess, special hoods connected with exhaust pipes are placed over grinding wheels, over rotary saw blades, over polishing wheels, and so on, to draw the dust away from the point at which it is produced (Fig. 168).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc. ] Ginn and Company


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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology