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360 ■*= Explanation of explanation of THE DIFFERENT APPARATUS, EXHIBITED UPON I THE DIFFERENT ANNEXED PLATES, TAB, II, III, IV, As may be required for examining and analy. fing Mineral Subftances, Sect. i, FOR POUNDING or PULVERISING. 13, Tab. II. An iron mortar of a middling fize, for dividing large maffes of minerals into fmaller pieces, to render fuch convenient for examination, and more fit for pulverifing