Concept
Photometry
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Studies in the photometry of lights of different colours / by Herbert E. Ives. : spectral luminosity curves obtained by the equality of brightness photometer and the flicker photometer under similar conditions.
Ives, Herbert Eugene, 1882-1953.Date: [1912]
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Illumination : its distribution and measurement / by Alexander Pelham Trotter.
Trotter, Alexander Pelham.Date: 1911
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Civil engineering: canals (below), and a photometer (above). Engraving by Mutlow.
Reference: 44546i