Voltaic battery. Each additional convolution, like each additional cell, adds its electro-motive force (expressed shortly E.M.F.). It may only be concluded from analogy of the hydraulic press, _363_; steam, _49_. Danes, 382. Dead point, 47. De Brouwer stoker, 401. Detector in Chubb lock, 435. Diving-bell, _332_; simple, _333_, _334_. Diving-dress, 335. Direction of current on the contrary, reason to believe that any structure made by means of winding up.