Letter | Published:

Recent Improvements in Diffraction Gratings and Replicas

Nature volume 140, pages 723724 (23 October 1937) | Download Citation



THE advent of the aluminized glass mirror has done away with many of the difficulties of making diffraction gratings of large size and unique properties. Some years ago, after some preliminary experiments in diamond grinding and adjusting, we ruled a six-inch three-metre concave grating with 15,000 lines to the inch which threw about 80 per cent of the light into one first-order spectrum. This estimate was made with a photo-electric cell and the light of a high-intensity mercury arc passed through a green filter.

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  1. Lake Louise, Alberta, B.C. July 15.

    • R. W. WOOD


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