* 6.70 francs on 3,100. The loss by wear allowed on the French 20 and 10 francs is 0.7 per cent., inclusive of the tolerance of 0.2 per cent.; on the British sovereign, 0.628 per cent. TABLE XII.-PRODUCTION OF GOLD. Table showing approximate production of the principal gold fields of the world, according to Phillips.1 The Mining and Metallurgy of Gold and Silver, page 127. * The yields of the different members of this group vary considerably from year to year, but the aggregate product is believed to remain tolerably constant, TABLE XIII.-PRODUCTION OF SILVER. Table showing the approximate yield of the principal silver-producing countries, according to Phillips.1 1 The Mining and Metallurgy of Gold and Silver, page 320. * Obtained from the island of Sardinia, where it is found associated with galena. TABLE XIV.-PRODUCTION OF THE PRECIOUS METALS, ACCORDING TO BIRKMYRE-1846 and 1850. Comparative table showing the annual produce (approximate calculation) in value of fine gold and silver for 1846 and 1850, the first being two years before the discovery of the rich deposits of gold in California, the latter two years after the discovery. Exclusive of China and Japan, which produce large quantities of gold and silver, the amount of which is 1 quite unknown to Europeans. APPENDIX E. METRICAL AND OTHER WEIGHTS AND THEIR EQUIVALENTS. For the convenience of those who consult this report, the metric system of weights, with the equivalents of its denominations in troy and avoirdupois weights, are given below, together with equivalents and values of some other systems of weights and values. In the foregoing pages, for the conversion of figures given in pounds. (£) sterling into dollars, when exact figures were not essential, as in the case of estimates and round numbers, $5 has been taken as the equiva lent of the £; and when sums expressed in francs have been converted into dollars, 5 francs has been taken as the equivalent of one dollar. In calculating the value of amounts of silver expressed in troy ounces, the ounce has been reckoned as worth $1 25. For native gold the value per ounce has been reckoned as at from $16 to $20, according to the source of production. In the statistics of yield of gold and silver in the United States, when tons are mentioned, a net or "short" ton of 2,000 pounds avoirdupois is intended, unless it is otherwise stated. Table of metric weights and their equivalents in avoirdupois and troy weights. |