Specification of James Dewar : employing vulcanite in forming instruments for inhalation, &c.

  • Dewar, James, 1842-1923.
Date:
1867
Catalogue details

Licence: Public Domain Mark

Credit: Specification of James Dewar : employing vulcanite in forming instruments for inhalation, &c. Source: Wellcome Collection.

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    Dewar s Impts. in Employing Vulcanite in Forming Instruments for Inhalation, cfc. known as the spray producer. The manner in which vulcanite is produced is well known. For the sake of more clearly defining my Invention I shall now describe the instrument called the spray producer as at present usually constructed, 5 and of which a Drawing is hereto attached. The numbers herein-after mentioned have reference to and correspond with those marked on that Drawing. The instrument generally consists of an air vessel or chamber No. 1 composed of some elastic material, and capable of being discharged of the air 10 contained in it by pressure, and of being refilled by its own elastic action. This chamber has an orifice for the admission of air in the shape of a short pipe, and it as well as the vessel or chamber No. 3, herein-after described, is fitted with a valve to prevent the backward expulsion of the air. No. 2 is a flexible tube conducting the air discharged from the chamber last described 15 into a second elastic vessel or chamber No. 3, which is fitted with a valve to prevent the backward escape of the air, and is covered with a network of silk or cotton to restrain expansion, and which forms a reservoir by which a continuous current of air may be kept up through the flexible tube No. 4, which conducts the air discharged from the aforesaid reservoir to a straight 20 tube No. 5, terminating in a tapered point with a small orifice No. 6. No. 7 is a wide mouthed vessel or bottle which has a lid or stopper with holes in it, through which pass the tubes 8 and 10, herein-after described. The liquid from which the spray is intended to be produced is placed in this vessel or bottle. No. 8 is a bent tube terminating in a point No. 9 curved upwards, 25 and which point has a very small orifice. The other end of this tube passes through the lid or stopper into the vessel No. 7, and is submerged in the liquid therein contained, from which the spray is to be produced. No. 10 is another bent tube, the upper half of one end of which being filed or cut off forms a trough or drain by which the surplus liquid is caught and run back 30 into the vessel or bottle, and by which air is also admitted into the vessel or bottle. The other end of this tube is inserted into a hole in the lid or stopper of the vessel or bottle. No. 11, 11, are bands holding the tubes 5, 8, & 10 in the position represented in the Drawing. No. 12 is merely a wooden box for holding the instrument. The air being discharged by pressure from tho * 35 air chamber No. 1 passes through the tube No. 2 into the chamber No. 3, from which it again passes through the tube No. 4 into the tube No. 5, from the point of which No. 6 it issues with some force, and playing exactly over the upturned orifice of the point No. 9 of the tube No. 8 exhausts the air in that tube. The liquid contained in the vessel No. 7 rising into the tube to fill