...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」
...The largest of the Scoters, length 22 inches,distinguished by a large white speculum on thewing, also a white comet extending from underthe eye backwards...
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)」
...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」
...Head andthroat brown; breast and back gray, a white throat-ring;belly and speculum white...
Frank M. Chapman 「Color Key to North American Birds」
...A whitish patchon either side of head; throat and upper parts grayishbrown; belly and speculum white...
Frank M. Chapman 「Color Key to North American Birds」
...No colored speculum...
Frank M. Chapman 「Color Key to North American Birds」
...Female—Head, dark buff; breast, lighter buff withbrown mottlings; legs, orange colored; speculum sameas the male; bill, yellow, blotched with brown...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Color—Male—Head and neck, green; breast, white,shading into rusty chestnut toward the abdomen; lesserwing-coverts, blue; speculum, green, with white border;legs, orange red...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...The speculum is gray; bill, bluish with a pale blue bandacross it about a half inch from the end...
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」
...Toovercome the spherical aberration James Gregory, ofAberdeen and Edinburgh, in 1663, in his Optica Promota, proposed areflecting speculum of parabolic form...
George Forbes 「History of Astronomy」
...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 king inquired after him, and after my great speculum...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...Furnaces for the speculum metal were built, standserected, and the 40-foot telescope fairly begun...
Oliver Lodge 「Pioneers of Science」
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