OCR Text |
Show NEEDLE DUST. In factories where needles are made the grindstones throw off great quantities quan-tities of minute steel particles, with which the air becomes heavily charged, although the dust is too fine to be perceptible to the eye. Breathing Breath-ing the dust shows no immediate effect, ef-fect, but gradually sets up irritation, usually ending in pulmonary consumption. con-sumption. Ineffective efforts were made to screen the air by gauze or linen guards for nose or mouth. At last the use of the magnst was suggested, and now masks of magnetized steel wire are worn by workmen and effectually remove re-move the metal dust before the air is breathed. |