| 1. | Reflected light was measured using a pyrometer lamp as a photometer.
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| 2. | It may also be measured with a photometer lowered into the water.
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| 3. | Ritchie's photometer depended on equal illumination of surfaces.
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| 4. | The photometer measured in the 7 band Geneva photometric system.
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| 5. | :: : A photometer is a fairly common item.
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| 6. | The optical depth of the atmosphere can be measured with a sun photometer.
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| 7. | The photometer, devised by Beer, is shown in the gallery below.
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| 8. | This included new types of calorimeter and photometer detectors.
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| 9. | In filter photometers, optical filters are used to give the monochromatic light.
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| 10. | He led the Multiband Imaging Photometer ( MIPS ) instrument team for Spitzer.
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