[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [Indian Science and Technology in the Eighteenth Century: Some Contemporary European Accounts](https://indike.org/pramana/ins.science.dharampal-1971) › c8.18 # Indian Science and Technology in the Eighteenth Century: Some Contemporary European Accounts c8.18 Indian Science and Technology in the Eighteenth Century: Some Contemporary European Accounts c8.18 - **Language:** English ### [c8.18](https://indike.org/pramana/ins.science.dharampal-1971.c8.18) A, \*b\* are circular walls; \*a\* is 24 inches thick, and near 16 feet radius; \*b\* is concentric with \*a\*, 18 inches thick, and between 12 and 13 feet radius. \*C\* is a cylinder of stone, its center is the center of the walls. \*B\* and \*C\* are of equal height, viz, 4 feet 2 inches; the outward wall is 8 feet and 4 inches. The tops of these walls are horizontal, and are very nicely divided into degrees, and subdivided into arches of 6'. At the cardinal points on the top of the wall \*a\*; there are two iron pins, from which I conjecture there has been an instrument to fix upon the wall, though I do not know for what purpose or of what kind. - [Previous: c8.17](https://indike.org/pramana/ins.science.dharampal-1971.c8.17) - [Next: c8.19](https://indike.org/pramana/ins.science.dharampal-1971.c8.19) - [Up: c8](https://indike.org/pramana/ins.science.dharampal-1971.c8) --- Source: [https://indike.org/pramana/ins.science.dharampal-1971.c8.18](https://indike.org/pramana/ins.science.dharampal-1971.c8.18) · Pramāṇa