The Spectrohelioscope

Details The Spectrohelioscope The Spectrohelioscope

Jan 1925

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1925natur.115...50h&link_type=abstract

Nature, Volume 115, Issue 2880, pp. 50 (1925).

Physics

Scientific paper

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 narrow and hence close together in order to give sufficient light with the requisite purity, the motion of the spectral line is practically equal to that of the slit for the small displacements from the optical axis involved. Thus it is possible to avoid the use of such deflecting prisms and gearing as Mr. Stanley employs. I have not yet attempted, however, to design a short focus instrument.

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