eta meaning, definition, what is eta: the seventh letter of the Greek alphabet. Learn more.
shafts definition, shafts meaning | English dictionary. shaft. 1 the long narrow pole that forms the body of a spear, arrow, etc. 4 a rod or pole forming the handle of a hammer, axe, golf club, etc.
An 1841 textbook used the term to refer to a short shaft driven by a belt from the line shaft and driving the spindle of a lathe through additional belts. From Wikipedia