...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」
...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)」
...Feathersabout base of bill white; breast and back rustygrayish brown; speculum white...
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」
...No colored speculum...
Frank M. Chapman 「Color Key to North American Birds」
...Female—The top of the head of the female is a rustybrown, and with a very faint stripe on the sides; upperparts, gray, spotted with black; speculum, green...
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 general color isbuff, mottled with brown; wing-coverts and speculum,same as the male...
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」
...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」
...Furnaces for the speculum metal were built, standserected, and the 40-foot telescope fairly begun...
Oliver Lodge 「Pioneers of Science」
...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」
...The king inquired after him, and after my great speculum...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...Company is not always pleasing, and I would much rather be polishing a speculum...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
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