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KF5JRV > TECH 22.12.16 14:36l 23 Lines 1306 Bytes #-3194 (0) @ WW
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Subj: The Crescograph
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Sir Dr. Jagadish Chandra Bose
(Nov. 30, 1858 – Nov. 23, 1937) Bose invented the Crescograph an electrical instrument that could measure the growth of a plant
. He worked as a physicist, biologist, botanist, archaeologist and was a writer. He is recognized as the inventor of the first
wireless detection device and for his discovery of millimeter length electromagnetic waves. India, in 1958 issued a commemorati
ve postage stamp in honor of the centennial of his birth.
The Crescograph can measure 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 points. Tw
o lever arms form a parallelogram that holds the core centered within the opening of the differential transformer as it moves u
p and down. A micrometer is used to adjust and calibrate the system.
73 Scott KF5JRV
KF5JRV.#NWAR.AR.USA.NA
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