Intensity and range of lighthouse lamps, 1864.

Intensity and range of lighthouse lamps, 1864.
2 3 c m
40cm
actual image size: 32cm x 15cm

Description

Diagram illustrating the flashing frequencies and distances reached, of various lighthouse lamps. From 'Memoire sur l'eclairage et le balisage des cotes de France', a work on French lighthouses by Leonce Reynaud (1803-1880), published in Paris in 1864.

© Science Museum / Science & Society Picture Library

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