...This strikingly marked Duck is twenty inchesin length, has a green head and speculum, bluewing coverts and chestnut belly... 
Chester A. Reed 「The Bird Book」
...Similar to the Lesser Scaup in size and plumage,except that it has a narrow chestnut collararound the neck, the back is black instead ofbarred with white, and the speculum is gray instead of white...
Chester A. Reed 「The Bird Book」
...—Black; large alar speculum, axillaries, and under wing-covertswhite; bill pale yellow; feet brown: total length 5·8 inches, wing 2·9, tail 2·5...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Head and throatrusty, finely streaked and barred with black; breast andsides rusty; speculum blackish...
Frank M. Chapman 「Color Key to North American Birds」
...Feathersabout base of bill white; breast and back rustygrayish brown; speculum white...
Frank M. Chapman 「Color Key to North American Birds」
...Feathers about sides of baseof bill and throat white, back and breast rusty grayishbrown; speculum gray...
Frank M. Chapman 「Color Key to North American Birds」
...Whileit somewhat resembles the female mallard, the muchnarrower bill and difference of the speculum shouldprevent any error in identification...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Color—Male—Head and neck, black, showing a greenluster in the sun; back, gray, finely lined with black;under parts, white; speculum, white...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Head and upper parts, adark, dead brown; under parts, white; speculum, white;a small, elongated white spot on the side of the head...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...These wereilluminated by a speculum, near the object-glass, reflecting the light from alantern placed over the axis, the upper part of the telescope-tube being partlycut away to admit the light...
George Forbes 「History of Astronomy」
...Furnaces for the speculum metal were built, standserected, and the 40-foot telescope fairly begun...
Oliver Lodge 「Pioneers of Science」
...Sir John, grown more confident,adduced the example of the Newtonian reflector, in which therefrangibility was corrected by the second speculum, and the angle ofincidence restored by the third...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...The mirror or speculum, as it is often called, is a thickmetallic disc, composed of a mixture of two parts of copper with one oftin...
Robert Stawell Ball 「The Story of the Heavens」
...The king inquired after him, and after my great speculum...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
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