186 BULLETIN 12, UNITED STATES NATIONAL MUSEUM. 



Accessories. 



(1) Fire clay. Woodbridge, Middlesex County, New Jersey. (55827.) 



(2) Saudy clay. Woodbridge, Middlesex County, New Jersey. (55828.) 



(3) Burnt clay. (55829.) 



(4) Quartz sand. (55830. ) 



(5) Ketort, old. (55831.) 



(6) Retort, old, ground. (55832.) 



(7) Retort, new. (55833.) 



OXIDE FURNACE SAMPLES. 

 Ore. 



(1) Franklinite, willemlte, zincite, and calcite, lump ore. Buckwheat Field Mine- 

 Franklin, Sussex County, New Jersey. (54129.) 



(2) Franklinite, willeiuite, zincite, and calcite, crushed, ready for furnaces. Buck, 

 wheat Field Mine, Franklin, Sussex County, New .Jersey. (54130.) 



This ore yielded ou analysis in the laboratory of the department by Mr. J. A- 



Allen— 



Per cent. 



Silica (SiOo) 10.68 



Zinc (Zn) 29.86 



Manganese (Mn) ...• 11. 19 



Iron (Fe) 20.07 



Alumina (Al.^Os) 0.82 



Lime (CaO) 4.50 



Magnesia (MgO) 0. 39 



Carbonic acid (CO,) 3.93 



(3) Franklinite, willemite, zincite, tephi'oite, and calcite, lump ore. Sterling Hill 

 Mine, Ogdensburgh, Sussex County, New Jersey. (54131.) 



(4) Franklinite, willemite, zincite, tepbroite, and calcite, crushed, ready for fur- 

 naces. Sterling Hill Mine, Ogdensburgh, Sussex Couuty, New Jersey. (54132.) 



This ore yielded on analyses in the laboratory of the Department by Mr. J. A. 

 Allen- 



Per cent. 



Silica (SiOo) 7.80 



Zinc (Zn) 19.80 



Manganese (Mn) 8.89 



Iron (Fe) 16.44 



Alumina (Al.O:,) 1.09 



Lime (CaO) 15.91 



Magnesia (MgO) 2.08 



Carbonic acid (CO;) 14.11 



Fuel. 



(1) Anthracite coal. (54136.) 



(2) Anthracite coal dust, used for reducing the zinc in the retorts and oxide fur- 

 naces. (54137.) 



Furnace charge. 



(1) Ore, mixed with anthracite coal dust. (55835.) 



Products. 



(1) Oxide of zinc, obtained from Franklinite ore by smelting wi^h coal dust and 

 reoxidizing the distilled zinc ; it is afterward cooled and collected in muslin bags. 

 (54140.) 



