optics, and in every other coarse emery wheel. discovery may be understood when it is known that in branch of scientific and practical work, great advances Fig. 2 showsthe same tool ground upon an emery the first ten years following the introduction of the ar- have been made, so that the highest… … perfect, and would not be benetited in the least in the manufacture of printing inks, and would advise any one with a turn for chemistry to by the application to it of a file or any abrading material. ; investigate this subject. What has been said with regard to the diamond point- for securing that…
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