Mercurial Air-holder and Breathing Machine. Plate at the begining of Research 1: Concerning the Analysis of Nitric Acid and Nitrous Gas and the Profuction if Nitrous Oxide. Fig 1 Represent a section of the machine, which consists of a strong glass cylinder (A), cemented to one of the same kind (B), fitted to the solid block (C), into which the glass tube (D) is cemented for conveying air into the moveable receiver (E). The brass axis (Fig 2, F) having a double bearing at (a, a) is terminated at one end by the wheel (G), the circumference of which equal to the depth of the receiver, so that it mat be drawn to the surface of the mercury by the cord (b) in one revolution; to the other end is fitted the wheel (H) front view seen in Fig 3...