[PT031AAT], Patent Caveat, Thomas Alva Edison, December 8th, 1889


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[PT031AAT], Patent Caveat, Thomas Alva Edison, December 8th, 1889

Editor's Notes

Caveat Listening tube [drawings follow]##Iron concentrating. Crush & separate, run tailings through more powerful separator, run concentrator from this through Cruchser & reconcentate. Now sieve the 1st and second concentrate through holes 50 pct smaller than original sieve & recrush & reseparate he produce not passing through the 2nd sieving--##To briquet. Crush concentrate to 30@40 mesh crush Bituminous Coal to say 50@80 mesh mix and put in iron pots holding say 20 lbs bring to red heat to cake the whole##another method is to add small quantity coal tar in crude petroleum.##Another plan is to crush all to 100 mesh mixed proper quantity lime for flexing Silca and proper quantity of 100 mesh Bituminous Coal to reduce iron bake in flat iron recepticale or use a briquet machine & then bake--##Making Carbonado by using arc carbons and a Carbonasious Compound##No 1 foundry by using the mouldin imprint over a heated surface ie in a place where the sand mould is red hot.



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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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