- Crescograph
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A crescograph is a device for measuring growth in plants. It was invented in the early 20th century by Sir Jagadish Chandra Bose, an Indian scientist.
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, gasses and electricity.[1]
A Bose inspired modern electronic Crescograph [2] 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 “Organic Biofield Sensor” [3] by H. E. Puthoff and R. 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 movements such as 10,000,000 times.
References
- ^ edsanders.com - Jagadis Bose Research on Measurement of Plant Growth (reproductions of Bose Research Institute books from the Hanscom AFB Geophysical Research Library) retrieved April 27, 2007
- ^ Modern Electronic Crescograph
- ^ "Organic Biofield Sensor” Electronics and Bioengineering Laboratory S.R.I Project 3194 (Task 3) November 1975 By: H. E. Puthoff and R. Fontes
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