"Some New Possibilities in Solar Research," NATURE, July 3, 1926; "The Fields of Force in the Atmosphere of the Sun," NATURE, May 14, 1927. This is nearly the size of Hilger's plane grating K14, ruled ...
I AM very glad to learn from NATURE of November 8, p. 683, that Mr. F. Stanley is also engaged in developing a spectrohelioscope. In my long focus (13 feet) instrument, where the slits are rather ...
Solar Research for Amateurs-II How to Construct the Spectrohelioscope, Which Reveals Solar Phenomena In Actual Motion By George Ellery Hale ...
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