... The fourth division consisted of the thumb-screw, speculum oris, and chains and shackles of different kinds, collected at Liverpool... 
Thomas Clarkson 「The History of the Rise, Progress and Accomplishment of the」
...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」
...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」
...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」
...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」
...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」
...Furnaces for the speculum metal were built, standserected, and the 40-foot telescope fairly begun...
Oliver Lodge 「Pioneers of Science」
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