Optical Analog Gravity Computer 3

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Item Optical Analog Gravity Computer
Item code
Description Assembled
Manufacturer SSC
Circa 1966
Donor RMS Energy
Location Houston Geoscience Center
Serial number
Taxonomy GSH570C

The Optical Analog Computer The CGC 5000 computer was designed to semi-automate the graticule/dot chart calculations formerly done by hand, thereby speeding up the process and allow for more modification to anomalous bodies and to test more complex geologic situations. A very basic principle of its operation was the measurement by photo-electric cells of the relative-intensity of light passing through (or obscured by) a model placed over an optical graticule. The light source was a series of fluorescent tubes and the graticule was fixed in place over them. A transparency of the geologic model could be moved across the graticule to approximate a series of readings or calculations along a profile. The relative transparency of the model could be varied to approximate relative densities of the geologic section it represented. The equipment required calibration by means of a photo-electric "reference cell", adjustments to the galvanometer system, and corrections for graticule edge effect and "blind spot".