## On the Theory of the Matthews and the Russell Leonard Photometers for the Measurement of Mean Spherical and Mean Hemispherical Intensities, Issue 12 |

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On the Theory of the Matthews and the Russell-Léonard Photometers for the ... Edward P. Hyde No preview available - 2017 |

On the Theory of the Matthews and the Russell-Léonard Photometers for the ... Edward P. Hyde No preview available - 2016 |

### Common terms and phrases

actual agree angles applying arc lamps arrangement assume axis calculate cent circle closely computes consider consideration constructed corre corresponding course determine direction distribution of mirrors divide the semicircumference divisions ellipse end mirrors entirely equal arc equal area equal distribution equation evaluate exactly equal expression follows form of intensity give the true given given in column gives the mean Hence horizontal illumination incandescent lamps integral solution intensity curve intervals lies light limiting Matthews instrument mean hemispherical mean intensity mean spherical intensity mean spherical value mean value measurements mirror-pair mirrors satisfying mirrors the angular nearly number of mirrors obtained photometry place a mirror position problem readings Russell-Leonard photometer satisfy screen sector side sin2 sphere sponding successive zones summational values Suppose surface Table Theory true integral value typical curve vertical plane whole yield zones of equal