Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 260
This must be carefully distinguishedfrom the investigations of Blondel andmyself, in which the direction of viewor the angle of emission is fixed foreach experiment, and the angle ofincidence varies. If Wieners plastersurface had justified Lamberts observa-tion that ; the plane surface,… … FlG. 7.—Blondel. depolished enamelled iron. bright, the polar diagram would be asemi-circle, the equal radii representingequal brightness as seen from differentdirections, and the rectangular plottingwould give a horizontal line.
Lighting
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