Elements of inorganic chemistry : descriptive and qualitative . and oresof iron; chrome alum or other chromium salts; metallic aluminum andas many commonly occurring aluminum compounds as possible; metallicnickel and ores of nickel; cobalt ores; manganese ores; commercial formsof metallic zinc. 99. The Fourth Group Metals. Barium dioxide, hydroxide, and asmany barium-bearing minerals as possible; strontium nitrate ; many cal-cium bearing minerals; metallic magnesium ribbon, and many magnesium-bearing minerals. The Fifth Group 3Ietals are already provided for. 3G2 APPENDIX. GENERAL
Elements of inorganic chemistry : descriptive and qualitative . and oresof iron; chrome alum or other chromium salts; metallic aluminum andas many commonly occurring aluminum compounds as possible; metallicnickel and ores of nickel; cobalt ores; manganese ores; commercial formsof metallic zinc. 99. The Fourth Group Metals. Barium dioxide, hydroxide, and asmany barium-bearing minerals as possible; strontium nitrate ; many cal-cium bearing minerals; metallic magnesium ribbon, and many magnesium-bearing minerals. The Fifth Group 3Ietals are already provided for. 3G2 APPENDIX. GENERAL this heading is included that apparatus which is of generalutility. The teacher may need some of it for special purposes, while someof it is so placed that the students may have access to it at anytimeMuch of this apparatus may be used in physics also. 100. A Becker or Troemner Balance, Fig. 23, is to he recommendedon account of its cheapness, neatness, accuracy (sensitive to 2-e) anddurability. By placing a small shelf or table over one pan, so that the. Fig. 23. balance may play freely, it will answer well for specific gravity Theauthors students have used this balance for three years, and it is still a,good as new. Accompanying it is a set of weights in a polished velvet-hned box, with forceps, and a tray divided into compartments for thesmall weights, and covered with a glass slide. These weights were im-ported at a cost of §; they run from 60s to 1* in brass and to1S in platinum. 101. A Pair of Counter-Poised Watch-Crystals are useful inweighing those substances which would attack the pans of the balance. GENERAL APPARATUS. 363 102. A Weighing Flask for iodine and other volatile substances isdesirable. 103. A Specific Gravity Bottle of 50cc capacity is useful in deter-mining the specific gravity of fluids. 104. A Pair of Hydrometers. One for fluids lighter than water, andone for fluids heavier than water. 105. A Pair of Good Centigrade Chemical Thermometers
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