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Figure 2: Compound lever crescograph – an invention by Prof. JC Bose in the early 20th century; apparatus is on display at the Bose Museum in Kolkata [Printed with permission from: Prof. Sujoy Kr. Das Gupta, Director (Officiating) Bose Institute, Kolkata]:

Figure 2: Compound lever crescograph – an invention by Prof. JC Bose in the early 20<sup>th</sup> century; apparatus is on display at the Bose Museum in Kolkata [Printed with permission from: Prof. Sujoy Kr. Das Gupta, Director (Officiating) Bose Institute, Kolkata]: