Manual of dental surgery and pathology . her. With regard to the mode of administration, etc., we rnay firstdescribe the apparatus, which, in a simple form, may consist of 328 MANUAL OF DENTAL SURGERY AND PATHOLOGY. a wrought-iron bottle of liquid gas supported in a box or strongfirm frame, so that it can readily be opened by the hand or footof the administrator (Fig. 293). A more perfect arrangementis when two bottles (Fig. 294) nre so connected that, on onefailing, the other may be brought into use. By a small flexibletube communication is made between the bottle or bottles anda bag construc
Manual of dental surgery and pathology . her. With regard to the mode of administration, etc., we rnay firstdescribe the apparatus, which, in a simple form, may consist of 328 MANUAL OF DENTAL SURGERY AND PATHOLOGY. a wrought-iron bottle of liquid gas supported in a box or strongfirm frame, so that it can readily be opened by the hand or footof the administrator (Fig. 293). A more perfect arrangementis when two bottles (Fig. 294) nre so connected that, on onefailing, the other may be brought into use. By a small flexibletube communication is made between the bottle or bottles anda bag constructed of sheet India-rubber, of oval or sausage form,and capable of containing about one gallon, connected at itsopposite extremity almost directly with the face-piece, it beingimportant that that there should be the least possible impedimentto the passage of the gas from or to the bag. A two-way stop-cock of large dimensions serves to close the bag, and at the sametime to admit air to the face-piece (Fig. 295) which is attached Fig. Clovers face-piece and two-way stopcock. The face-piece is constructed of thin sheet lead orcomposition metal, capable of being bene to the form of the face, and covered with leather. At!the metal is apt to break away, a thin but unyielding metal is to be pi-cferred. The face-piece asnow supplied has an air or water-pad where it meets the patients face, which makes it fit air-tight: A, represents the outlet or expiratory valve; B, the inlet or inspiratory valve. In theapparatus which we employ there is only the expiratory valve, the plan now adopted by , shows where a supplemental bag for economizing the gas can be attached, but this on the planwhich we is unnecessary ; C, shows the two-way stopcock. to it: the latter we prefer constructed of thin but unyieldingmetal, provided with an outlet-valve only, capable of beingclosed whilst the edges which approximate to the face are sur-rounded with an India-rubber water-jjad. The obje
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectdentist, bookyear1882
