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1874 Scientific American  
The RelatIve EftlclencJ' oC EngInes and Bollen. miniatration? It is always found that men appointed for a found that I could make it by distilling phosphrous over lengthened period, independently of party or political con· red hot chalk in a covered crucible; as I had no earthen cover siderations, will get through more work and do it infinitely for the cruoible, I substituted a copperitisb, wh'ch contained better than those who feel insecure in their official position. red lead. When the chalk
more » ... ad. When the chalk Wad heated to almost a white
doi:10.1038/scientificamerican01241874-52 fatcat:zo4xlrbvwvgkled6wthwq464ay