William Tyler Olcott,
A Field Book of the Stars — Meteoric Showers…
(1911)
“ N. E. Beta Herculids June 7 Near the Crown Sl. B. A fire ballradiant, S. E Beta Ophiuchids June 10 About 8° S. of Ras Alhague Sl. June 10,13 S. E. Delta Cepheids June 20 About 13° from (β) Cassiopeiæ Sw. June 10-28,July 19,Aug 25, etc. N. The Abbreviations under Characteristics are as follows: V.—very. M.—moderately. SW.—swift. SL—slow. Sh.—short. B.—bright. F. faint. Sk.—streak-leaving meteors. T.—train−leaving meteors. ”
