The Astronomical Observatories of Jai Singh c10.36

c10.36

pillar is replaced by an iron rod. At Delhi the pillar is graduated by vertical stripes see figure 48), each six degrees in width, and these are necessary, as a point on the top of the edge (not the centre) of the pillar is the centre for which the altitude graduations on the corresponding sector and portion of the wall are made. The old descriptions and drawings show that no important structural alterations have been made during the last century. The Daniells’ picture (figure 44), however, apparently shows a different entrance to the north Rām Yantra.