Venkiteshwaran, S.P., and N. Narayana Iyer. “Construction of Clocks Driven With Weight and With Automatically Wound Springs for Use With Seismological and Other Instruments”. MAUSAM 2, no. 2 (April 1, 1951): 161–163. Accessed November 23, 2024. http://103.215.208.102/index.php/MAUSAM/article/view/4676.