The author has studied on the kinds, chemical compositions and the refractoriness of ashes of coking coals, producer coals and other coals. And the relations between ash quantities of coals and fixed carbon, volatile matter, moisture and calorie values of them, and the refractoriness of ash were also investigated.
The total number of samples presented to the test were about thirty-five, which were mined at various districts in Japan, Saghalien, North-China, Manchuria and Canada. Of these samples, the greater part were those of Japan and Saghalien coals, besides four kinds of North-China coals, two kinds of Manchuria coals and one kind of Canada coal were presented to the test.
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