JACOB DAVID WOLF

JACOB DAVID WOLF, in British patent No. 20,322, Oct. 7, 1905, described an improvement to his greased-belt apparatus.

HENRY LIVINGSTONE SULMAN, in United States patent No. 835,143, Oct. 20, 1905, duplicated British patent No. 19,709, Sept. 29, 1905.

SULMAN, PICARD, & BALLOT, in British patent No. 26,711, Dec. 21, 1905, described a process for separating heavy sulphides from each other. They begin with the known fact that in a pulp containing mixed sulphides in a sunken condition, if the sulphides are raised above the surface and allowed to drain, the sulphides take unto themselves films of air, and upon again seeking to immerse thfe drained pulp, the sulphides float ; and they discovered also that the time required for drainage and taking on of air-films varied in the different sulphides. By taking advantage of these drainage periods of different lengths they could effect a separation of the sulphides from each other. This is a novel conception, but the practical application of it has been a failure.

SULMAN, PICARD, & BALLOT, in British patent No. 26,712, Dec. 21, 1905, described a method of applying oil-and-gas flotation. This consisted in subjecting a freely flowing oiled pulp to pressure for the purpose of dissolving air or other gas therein, and when the pressure on the pulp was removed the air immediately escaped from solution and collected the oiled minerals and floated them ; also the introduction of highly aerated water with the pulp for the same purpose. They make use lierein of facts well known in physics under the name of Henry and Dalton's law, namely, the quantity of gas dissolved in water is in direct proportion to the pressure.

SULMAN, PICARD, & BALLOT, in Commonwealth patent No. 5,150, Jan. 31, 1906, duplicated British patent No. 26,712, 1905.

SULMAN, PICARD, & BALLOT, in Commonwealth patent No. 5,334, Feb. 26, 1906, duplicated British patent No. 26,711, 1905.

ARTHUR PENRHYN STANLEY MACQUISTEN, in United States patent No. 865,195, Mar. 17, 1906, duplicated British patent No. 25,204A, Nov. 19, 1904.

JAMES FRANCIS LATIMER, in United States patent No. 851,600, Mar. 27, 1906, described flotation processes as applied to graphite concentration.

SULMAN & SULMAN, in British patent No. 9,981, April 28, 1906, described the adaptation of the buddle and rubber strakes to flotation processes, whereby the particles are exposed to the air advantageously.

AUGUSTE JOSEPH FRANCOIS DE BAVAY, in Commonwealth patent No. 6,239, June 21, 1906, described a flotation process where a fluoride or a carbonate is added to the acid pulp.

GEORGE ALBERT CHAPMAN, in British patent No. 17,328, Aug. i, 1906, described an improvement to Sulman's previous patents. This is a method of limiting the amount of acid used in flotation. While it is advantageous to have some acid in the pulp to increase the selective action of the oil, it is not necessary to maintain the acidity of the whole mass for more than a short time ; the operation can be carried on in a neutral circuit if the acid is added before the oil. This is a working .detail of considerable importance.

HENRY LIVINGSTONE SULMAN, in British patent No. 19,944, Sept. 7, 1906, described a process in which the separation of minerals was brought about by the repeated exposure of the particles to the air, and by warming the liquid in which the operation was performed.

WALTER MURRAY SANDERS, in United States patent No. 988,737, Oct. 27, 1906, patented a non-acid process of flotationconcentration. DUDLEY HIRAM NORRIS, in United States patent No. 864,856, Nov. 19, 1906, described a method of effecting a separation of minerals by flotation by adding to a freely flowing pulp a portion of water in which air was dissolved at high pressure. His apparatus is new.

WALTER MURRAY SANDERS, in United States patent No. 911,077, Mar. 27, 1907, described an apparatus for performing flotation processes.

HOOVER & SULMAN, in British patent No. 13,268, June 7, 1907, described an apparatus for performing the high-pressure operation previously described by Sulman, Picard, & Ballot.

DUDLEY HIRAM NORRIS, in amended British patent No. 14,806, June 27, 1907, duplicated his United States patent No. 864,856, 1906, with modifications.

MARCUS RUTHENBURG, in British patent No. 28,191, Dec. 21, 1007, described a method of separating mixed sulphides by using a light oil instead of water, in ordinary table or vanner concentration.

LOCKWOOD & SAMUEL, in British patent No. 12,962, June 17, 1908, patented a process for making sulphide particles more magnetic by utilizing the selective action of oil.

FRANK BURNETT DICK, in British patent No. 16,667, Aug. 7, 1908, described a process for treating copper ores by an oil-andgas flotation process, where the ore is given a preliminary preparation by a reducing roast.

LOCKWOOD & SAMUEL, in British patent No. 26,264, Dec. 4, 1908, described a method of increasing the selective action of oil by treating it with various salts.

ARTHUR HOWARD HIGGINS, in British patent No. 26,852, Dec. 10, 1908, described a flotation process in which the frothing agents are aromatic hydroxides such as phenol.

SULMAN, PICARD, & BALLOT, in British patent No. 28,173, Dec. 24, 1908, described a method of securing flotation by the use of soluble frothing agents of the alcohol series.

HENRY AZOR WENTWORTH, in United States patent No. 938,732, Jan. 2, 1909, described a process of separating sulphides from each other where the sulphides were submitted to a slight roast for the purpose of rendering one or more of the sulphides non-floatable.

LOCKWOOD & SAMUEL, in British patent No. 16,229, Jan. 7, 1909, described a process wherein magnetic or magnetizable substances are added to an ore-pulp, the whole then treated with an oil to cause the sulphides and the magnetic particles to adhere together, and then removing them from the pulp in a magnetic machine.

LOCKWOOD & SAMUEL, in United States patent No. 933,717, Jan. u, 1909, duplicate in part British patent No. 12,962, June 17, 1908.

EDWARD JAMES HORWOOD, in Commonwealth patent No. 12,763, Jan. 13, 1909, described a process for separating zinc sulphide from lead sulphide by flotation, after first giving the concentrate a slight roast.

EDWARD JAMES HORWOOD, in amended British patent No. 1,789, Jan, 25, 1909, duplicated his Commonwealth patent No. I2 >763, Jan. 13, 1909.

GREENWAY, SULMAN, AND HIGGINS, in amended British patent No. 2,359, Feb. i, 1909, described a process of flotationconcentration accelerated by the use of soluble frothing agents.

THEODORE JESSE HOOVER, in British patent No. 4,911, Feb. 27, 1909, described an apparatus for applying the frothing process. This is probably the most important mechanical development in the whole series, and together with its later improvements crystallizes the commercial application of the flotation method.

GREENWAY, SULMAN, & HIGGINS, in United States patent No. 962,678, April 30, 1909, duplicated British patent No. 2,359, Feb. i, 1909.

FRANK WYNNE, in British patent No. 12,266, May 25, 1909, described an oil-belt apparatus.

JACOB DAVID WOLF, in British patent No. 15,469, July 2, 1909, described an improvement to his previous inventions.

SULMAN & PICARD, in British patent No. 26,019, Nov. 10, 1909, described a notation treatment for oxidized ores.

ALFRED ARTHUR LOCKWOOD, in United States patent, No. 956,773, Nov. 15, 1909, duplicated British patent No. 26,264, Dec. 4, 1908.

SULMAN, HIGGINS, & BALLOT, in British patent No. 28,933, Dec. 10, 1909, described a flotation process where turpentine is the agent.

FRANK BURNETT DICK, in British patent No. 2,500, Feb. i, 1910, described an improvement to his invention for the treatment of copper ores described in his British patent No. 16,667 f 1908.

HENRY AZOR WENTWORTH, in United States patent No. 980,035, March n, 1910, described a process of differential separation of mixed sulphides.

THEODORE JESSE HOOVER, in British patent No. 6,896, Mar. 18, 1910, described a form of apparatus for notation processes, being an improvement on British patent 4,911 of 1909.

SULMAN & PICARD, in British patent No. 8,650, April 9, 1910, described a process of preparing ores for flotation treatment, which consists in submitting them to a reducing roast.

THEODORE JESSE HOOVER, in British patent No. 10,929, May 3, 1910, described a form of apparatus for flotation processes ; a further improvement on British patent 4,911 of 1909.

ALFRED ARTHUR LOCKWOOD, in British patent No. 13,009, May 28, 1910, described a new magnetic notation method.

GREENWAY, SULMAN, & HIGGINS, in United States patent, No. 962,678, June 28, 1910, duplicated British patent No. 2,359, Feb. i, 1909.

THEODORE JESSE HOOVER, in United States patent No. 979,857, July 14, 1910, duplicated British patent No. 6,896, Mar. 18, 1910.

JAMES M. HYDE, in United States patent No. 1,022,085, April 2, 1912, described an apparatus and notation process where the acid required is added at some time and distance prior to the act of flotation the patent contains the first description of an ingenious method of making high grade concentrates and high recovery simultaneously.