COLLECTIONS IN ECONOMIC GEOLOGY AND METALT-URGY. 103 

 The. collection shows: 



Ore. 



(1) Oxidized, malachite in limestone. (55308.) 



(2) Oxidized, malachite containing a little nnaltered chalcopyritc and chert. 

 (55301).) 



(3) Sulphide, chalcopyrite in chert. Two characteriHtie samples. (55311.) 



(4) Snlphide. (5.5310.) 



(1) Iron ore, limonite. (.5.5307.) 

 (•>) Limestone. (5.5305.) 



Flux. 



Fuel 



(1) Bitnminons coal. (.55303.) 



(2) Charcoal, also used as a redncing- agent. (55304.) 



Intermrdiaie products. 



(1) Matte, from smelting the ores in the cupola. (.55291.) 



(2) Cupola slag, blact; produced in smelting matte. (55301.) 



(3) Cupola slag, liglit green ; produced in smelting matte. (55302.) 

 (1) Cupola slag, crystallized ; produced in smelting matte. (55300.) 

 (5) First skimming from the roaster. (55281.) 



(5) Second skimming from the roaster. (55282.) 



(7) Third skimming from the roaster. (55283.) 



(8) Fourth skimming from the roaster. (55284.) 



(9) Fifth skimming from the roaster. (55285.) 



(10) Sixth skimming from the roaster. (55280.) 



(11) Seventh .skimming from the roaster. (55287.) 



(12) Eighth skimming from the roaster. (55288.) 

 (I!{) Ninth skimming from the roaster. (.55289.) 



(14) Tenth skimming from the roaster. (5,5290.) 



(15) Pig copper, from the roaster. (50990.) 



(IG) Furnace bottom charged with metallic copper from the roaster. (.55280.) 



(17) First skimming from the refinery furnace. (55292.) 



(18) Second skimming from the refinery furnace. (55293.) 



(19) Third skimming from the r finery furnace. (55294.) 



(20) Fourth skimming from the refinery furnace. (55295.) 



(21) Furnace bottom, charged with metallic copper from the refinery furnace. 

 (55296.) 



Final Products 



(1) Ingot copper, small sample. (.5.5298.) 



(2) Ingot copper, small sample, showing coating of red suboxide of copper. 

 (55299.) 



(3) Ingot copper, full size, with its copper mold. (55297.) 



Accessories. 



(1) Qnartz .sandstone, used for making tlie bottoms .■iiid linings of the furnace. 

 (55306.) 



THE SCHUYLKILL COPPER ^VORKS. 



These works are located at Phcrnixville, Chester County, Pennsyl- 

 vania and employ the reverberatory fiu'iiace i)rocess entirely. They 

 treat the ores from various localities, the chief source of supplies being 



