Faraday’s rotation apparatus.
The apparatus consists of two, ivory, circular pools which are to be filled with mercury. Into these pools dip contacts at each end of a vertically mounted brass bar that is suspended by two pivot points at top and bottom. When electricity is applied by way of the mercury pools, the bar rotates in a horizontal plane. On a mahogany base, 28 x 15 x 4cm. Small damage on the upper ivory cup.