in great quantities presented new difficulties. To ob- Ss. Furthermore, the later investigations have re- carbon. If calcium cyanamide be again placed in a tain it directly from the atmosphere, it was necessary vealed the fact that the whole of the bottom chord retort, it changes to a cyanide. 1o… … rent of air over copper filings very highly heated. The sufficiently disconcerting to cause comment and con- product has proved itself equal, if not superior, to siderable anxiety among the workmen on the bridge. oxygen united with tge copper, forming an oxide, and various other mineral…
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