Papers and proceedings of the Royal Society of Tasmania . ded in the lime. To render the results more strictly comparable, they have beencalculated, excluding the carbonic dcid and water lost on ignition ineach case, as follow :— 12 3 Silica, soluble 27-58 27-04 26-86 Silica, &c., insoluble 5-26 1-12 1-44 Oxide of iron 2-74 2-24 2-16 Alumina 4-00 3-47 480 Magnesia 1-16 1-23 0-95 Lime, &c 59-26 64-90 63-79 100-00 100-00 100-00 Variations in compositions of cements from several differentcountries are added for comparison :— Per cent. Silica 19-9 to 26-1 Alumina 5-2 „ 10-6 Oxideofiron 2-1 ,. 5-0
Papers and proceedings of the Royal Society of Tasmania . ded in the lime. To render the results more strictly comparable, they have beencalculated, excluding the carbonic dcid and water lost on ignition ineach case, as follow :— 12 3 Silica, soluble 27-58 27-04 26-86 Silica, &c., insoluble 5-26 1-12 1-44 Oxide of iron 2-74 2-24 2-16 Alumina 4-00 3-47 480 Magnesia 1-16 1-23 0-95 Lime, &c 59-26 64-90 63-79 100-00 100-00 100-00 Variations in compositions of cements from several differentcountries are added for comparison :— Per cent. Silica 19-9 to 26-1 Alumina 5-2 „ 10-6 Oxideofiron 2-1 ,. 5-0 Lime 59-1 ,, 67-3 Magnesia 0-3 „ 3*5 Sulphuric acid 0-3 „ 4-2 It will be seen that in the Maria Island material the silica is ratherabove the maximum, and the alumina rather below the minimumgiven above. Alteration in these respects would probably meanimprovement, but I am inclined to attribute the crumbling ofsample No. 3 to mode of preparation of the cement, as there aresome limestones which will yield cement or lime according to the.
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