peller shaft. suggested the use of the paddle wheel, so the the water. Palmer (1839) did this by pump- The contrivances for feathering floats are In 1729, Duquet submerged an apparatus ing in air, while Taylor (1846) allowed it to motion of a windmill may have prompted the numerous. In some cases,… … (1840). Parr (1825) cavsed the pressure of ver annually taken from the mines of Europe of the streain turned its shaft so as to wind tificial ivory,” may be very various besides the water to feather the float on an axis di- is valued at twenty-five millions of dollars. viding it uncqually ; Binns…
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