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Crescograph
A crescograph is a device for measuring growth in plants. It was invented in the early 20th century by Sir Jagadish Chandra Bose - a Bengali polymath, physicist, biologist, botanist, archaeologist.
The Bose crescograph uses a series of clockwork gears and a smoked glass plate to record the movement of the tip of a plant (or its roots) at magnifications of up to 10,000. Marks are made on the plate at intervals of a few seconds, demonstrating how the rate of growth varies under varying stimuli. Bose experimented with temperature, chemicals, gases and electricity.<〔(【引用サイトリンク】url=http://www.edsanders.com/bose )〕
A Bose-inspired modern electronic Crescograph 〔(Modern Electronic Crescograph ) 〕 was designed and built by Randall Fontes to measure plant movement at Stanford Research Institute for (S.R.I Project 3194 (Task 3) November 1975) which culminated in a report 〔(【引用サイトリンク】author=H. E. Puthoff and Randall Fontes ) 〕
The Electronic Crescograph plant movement detector is capable of measurements as small as 1/1,000,000 of an inch. However, its normal operating range is from 1/1000 to 1/10,000 of an inch. The component which actually measures the movement is a differential transformer. Its movable core is hinged between two points. A micrometer is used to adjust and calibrate the system. It could record plant growth magnifying a small movement as much as 10,000,000 times.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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