Andrew Cooper
Apr 22, 2007    Hale Pohaku, HI (map)
76mm f/6 APO

A large dark region almost 5° across, some areas completely starless, darker knots and streamers give a fair amount of structure to the region, punctuated by a few bright foreground stars

Rev. T.W. Webb
May 19, 1885    Hardwick, Herefordshire, England (map)

Near [NGC6273/M19] the large blank space in the body of Scorpio, where H. found scarcely any stars.

― Celestial Objects for Common Telescopes, T. W. Webb, 1917

E.E. Barnard
25cm f/5 Astrograph

Very large, diam. 3°, CD-26°12152 (6.2 arcmin) S of the middle. This vacant region, with its extension to the west running south of Theta Ophiuchi, is visible to the naked eye (see Popular Astronomy, 14, 580 1906.)."

― A Photographic Atlas of Selected Regions of the Milky Way, E.E. Barnard, 1927

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