| 21. | I covered the photometer with my thumb, and the reading did not change AT ALL!
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| 22. | In the 1880s and 1890s, light output measurements were usually measured with a horizontal photometer.
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| 23. | By 1992, the first commercial light scattering photometer providing a plurality of discrete detectors was introduced.
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| 24. | In 1885, Abney and Festing developed a colour photometer and undertook a range of colour measurements.
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| 25. | It would monitor distant stars with a photometer, looking for transits up to 10 thousand AU away.
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| 26. | In 1915, Stebbins used the new photometers to examine Beta Lyrae, a more irregular binary system.
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| 27. | Filter photometers are cheaper, robuster and easier to use and therefore they are used for routine analysis.
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| 28. | In 1922 Carleton professor Edward Fath constructed one of the nation's first photoelectric photometers in Goodsell.
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| 29. | Although the selenium cell photometer was proving successful, it was difficult to use and not very sensitive.
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| 30. | For example, Superior Enzymes used a LulzBot TAZ in fabricating an open source photometer for nitrate testing.
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