What day did the stock market crash? A)October 29, 1929
B)November 10, 1930
C)October 24, 1929
D)none of the above

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

answer; no longer than a reasonable period of time;