Memoirs of the Geological Survey of India . of wood. In other respects the process was as in the former case, and when finished, the kiln was broken down for the extraction of the lime- The mortar prepared from kunkur is very hard and lasting. In the Durability of kunkur ^^^ <^^ ^^^® Vellaur river at Shoundrasholaspuram I noticed some large masses of brick-work, the remains apparently of an old dam, in which the mortar had been worn by the united solvent and frictional action of the water, much less than the imbedded bricks by the latter action alone. Mortar appears, however to be used spar
Memoirs of the Geological Survey of India . of wood. In other respects the process was as in the former case, and when finished, the kiln was broken down for the extraction of the lime- The mortar prepared from kunkur is very hard and lasting. In the Durability of kunkur ^^^ <^^ ^^^® Vellaur river at Shoundrasholaspuram I noticed some large masses of brick-work, the remains apparently of an old dam, in which the mortar had been worn by the united solvent and frictional action of the water, much less than the imbedded bricks by the latter action alone. Mortar appears, however to be used sparingly in all stone edifices. In some of the large pagodas CitAP. I.] ECONOMIC GEOLOGY. 209 the stones are either laid together without mortar, or so little is usedthat it is not seen at the surface of the work. A large tank (now dry)at Naicolum, a few miles to the South of Ootatoor, is walled with beauti-fully cut blocks of gneiss, which appear to be built together entirelywithout the aid of any cement, and the same remark is applica-ble
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