1. Carbon Disintegration Test for Blast-Furnace Brick
2. *As noted in detail later, there is always a small weight loss due to removal of part of the oxygen of the initial ferric oxide (or magnetite in a few cases) used as catalyst. Thus the over-all weight increases are less than the total carbon deposit by the amount of this oxygen loss. This is disregarded here because (a) with a catalytic reaction having a wide variance in rate, the exact amount of carbon deposit is not important to the answers being sought and (b) the weight loss of oxygen is variable and almost impossible to determine with precision so that an exact correction could not have been made.