Astronomers Edison Pettit, (L) and Seth Barnes Nicholson of the Mt. Wilson Observatory have made the first systematic infrared observations of celestial objects using a thermocouple and a galvanometer. Nicholson is observing the thermocouple while Pettit watches the galvanometer. Pasadena, California: c. 1926.
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1920s19262People2peopleAstronomersAstronomicalObservatoryblackandwhitemonochromeCaliforniaCelestialObjectsEdisonPettitGalvanometerInfraredObservationsLookingThroughAnObjectMountWilsonObservatoryObservingPasadenaSethBarnesNicholsonThermocoupleUSAUnitedStatesastronomyblackandwhiteconcentrationdiscoveryhistoricalhistorymenpeopleresearchscientistsspectaclestwopeoplewatching
1920s221926AnAstronomersAstronomicalBarnesCaliforniaCelestialEdisonGalvanometerInfraredLookingMountNicholsonObjectObjectsObservationsObservatoryObservatoryObservingPasadenaPeoplePettitSethStatesThermocoupleThroughUSAUnitedWilsonandandastronomyblackblackconcentrationdiscoveryhistoricalhistorymenmonochromepeoplepeoplepeopleresearchscientistsspectaclestwowatchingwhitewhite
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