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Meaning of "dynamometer" in context in "A Law of Acceleration"

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A Law of Acceleration, Henry Adams, 1904

Adams, Henry. "A Law of Acceleration." Bartleby.com. N.p., n.d. Web. 4 May 2016.

In context, the word "dynamometer" (line 44) most likely refers to

A

"the ultimate object of science" (line 33).

B

"the sum or difference of attractive forces" (line 36).

C

"the historian" (line 39).

D

"some kinds of social movement" (line 39-40).

E

"the increase of volume of coal-power" (line 43).