... 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 speculum is green...
Chester A. Reed 「The Bird Book」
...Head and throat as in ♂, back fuscousand buffy; breast and sides ochraceous thickly spottedwith blackish; speculum ashy gray and white...
Frank M. Chapman 「Color Key to North American Birds」
...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」
...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」
...Such enlarged glands may bedifferentiated from tumors by passing the hand into the cow's throat after thejaws are separated by a suitable speculum or gag...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...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」
...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」
...The speculum of the American scaup, or larger blue-bill,is white, the head and neck showing a greenishsheen, quite pronounced in the sunlight...
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」
...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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