SSC Steno Grade C and D 13 Sep 2017 Shift 1 Paper

(2) A crescograph is a device formeasuring growth in plants. Itwas invented in the early 20thcentury by Sir Jagadish ChandraBose. The Bose crescographuses a series of clockwork gearsand a smoked glass plate torecord the movement of the tipof a plant (or its roots) at magnificationsof up to 10,000.