The ash content of Coal may be determined very quickly by our "ash meter." so ash quantity of coke can always regulate very easly to its optimam point.
The Baum washer modified by our idea has following great advantages.
1. piston valve imparts quick down motion and slow up motion to washing medium.
2. special shaped screen. rotating refuse valve and heavy part of coal work to control to get good result.

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The author investigated the effects of viscosity and vaporisation of several quenching media on cooling velocity. The results are as follows: (1) The relation between the mean cooling velocity (v) and the coefficient of viscosity (η) of oils is given by the equation v=a log1/η+b, in the range of temperature from 20°C to 100°C. Where a and b are constants which depend upon the characteristics of medium. (2) The addition of small amounts (less than about 1 per cent.) of water to oil, makes the stepped changes in cooling curve abnormaly, and retards the cooling velocities at relatively high temperatures, on account of the fact that the vaporisation of water contained in oil occurs during quenching.

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As the third alloying constituents, 0·5, I and 2% of Ni, Co, Cu, Ag, Ca, Cd, Mg, Al, Tl, Si, Sn, Pb, As, Sb, Bi, Cr, Te and Mn were added alone to the binary alloys of Mg-Zn, which contain 2, 3 or 5% of the latter element.
The corrosibility of these ternary alloys against N/10 NaCl solution and the artificial sea-water was tested in the cast and the quenched state. The Rockwell-hardness value of these alloys, after several heat-treatments, was also measured.
The addition of Ni, Co, Cu Al Tl, Pb and Bi make the said binary alloys more corrosible. On the contrally, the addition of As, Ca, Cd, Hg and Mn make the alloy more resistant to corrosion especially As and Mn gave the best result.
By quenching, the corrosibili'y of these ternary alloys is not improved, except the alloys containing Si, Sn, Tl and Pb.
The third constituents which harden the binary alloys are found to be Cu, Ni, Ag, Al, Si and Bi, while the hardening effect of Cd, Si, Hg, As, Sb and Pb which have a low melting point, is very small.
Hardening, due to aging (at 150°C) is observed throughout the specimens prepared, except the alloys containing Ni and Sb

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