TIME OF DISCOVERY OF THE METALS. 



249 



1020 

 1100 

 1200 

 1150 



1868 

 2012 

 2192 

 2102 



Highest heat of forge. 



| Agglomerate, but do not melt in forge. 

 Fusible in the oxyhydrogen blowpipe 



flame. 



Arsenic does not fuse, but volatilizes at a low red heat. 



Specific gravities of metals at 15.5 C, 



^lithium 



Potassium 



Sodium 



Calcium 



Magnesium . 



Strontium 



Aluminum . 



Barium 



Arsenic 



Antimony 



Zinc 



Tin 



Iron 



0.593 



0.865 



0.972 



1.57 



1.75 



2.54 



2.67 



4.00 



5.88 



6.72 



6.90 



7.29 



7.79 



Manganese 

 Molybdenum 

 Cadmium 

 Nickel . 

 Cobalt . 

 Copper . 

 Bismuth . 

 Silver 

 Lead 



Mercury . 

 Gold 



Platinum . 

 Iridium 



800 



863 



870 



870 



8.95 



896 



990 



10.50 



11.36 



1359 



19.36 



21.50 



22.42 



Time of discovery of the metals. 



Gold, 



Silver, 



Mercury, 



Copper, 



Zinc, 



Tin, 



Iron, 



Lead, 



Antimony, 



Bismuth, 



Arsenic, 



Cobalt, 



Platinum, 



Nickel, 



Manganese, 



Molybdenum, 



Chromium, 



Iridium, 



These metals were known to the ancients, because 

 either they are found in a metallic state, or can be 

 obtained by comparatively simple processes from 

 the oxides. 



J 



| Latter part of the fifteenth century. 



1694, by Schroder. 



1733, by Brandt. 



1741, by Wood. 



1751, by Cronstedt. 



1774, by Galm. 



1782, by Hjelm. 



1797, by Vauquelin. 



1804, by Smithson Tennant. 



