RT Journal Article SR Electronic T1 Further study of the solar corona JF American Journal of Science JO Am J Sci FD American Journal of Science SP 343 OP 358 DO 10.2475/ajs.s3-40.239.343 VO s3-40 IS 239 A1 F. H. Bigelow YR 1890 UL http://www.ajsonline.org/content/s3-40/239/343.abstract AB