2008-7-30improved methods of manufacture, in which electricity has played an important part, have made for more stable and healthful conditions for the working mann former days, the man in the mills puddled the iron in the furnace or fed the red-hot steel to the mills.
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Soil and dust samples are normally dried and sieved prior to analysishere is little conformity in the use of sieve sizes the literature contains examples of different sieve sizes in use, with 250 pm, 500 p and 1 m m being the most common cut-off sizesust samples are collected either by dustpan and brush or by vacuum techniques.