Word: blurs
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...duration of the flash can be timed approximately by noting the amount of blur (equal to the distance traveled during exposure) on the bullet. If the bullet travels at 1,000 ft. per sec. and the blur amounts to one-thousandth of a foot, the time interval is one-millionth of a second, fastest exposure ever accomplished...
...other rats. Labels attached to the rats or marks painted on them are not entirely satisfactory. A more popular method is notching or perforating the ears according to a code. Another is cutting off various combinations of toes, or different lengths of tail. Healing and regeneration of tissue sometimes blur such labels, however, and laboratory assistants sometimes make mistakes in the code pattern...
...fastest land animal, the cheetah (70 m.p.h.). Most of this publicity seems to have sprung from the reports of Dr. Charles Henry Tyler Townsend, 74, an Ohio-born entomologist who now lives in Brazil. Although the flight of botflies was visible to Dr. Townsend only as a "brownish blur," he estimated their speeds at 400 yards per second (818 m.p.h...
...Langmuir clinched his argument by making an artificial botfly of solder (one centimetre long, one-half centimetre thick), whirling this on a string in such a way that he could time its velocity with a telechron clock. At 13 m.p.h. the path of the artificial fly was already a blur, at 26 m.p.h. it was barely visible, at 43 m.p.h. the direction of rotation could not be told, and at 64 m.p.h. the object was entirely invisible. Comparing the appearance of his artificial fly while in motion with Dr. Townsend's descriptions. Dr. Langmuir concluded that a good estimate...
...mirror which will not blur in a steamy bathroom...