Specification of Arnold Hirst Watkins : respirators.

  • Watkins, Arnold Hirst.
Date:
1871
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Arnold Hirst Watkins : respirators. Source: Wellcome Collection.

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    2 A.D. 1870.—N° 3056. Provisional Specification. Watkins’ Improvements in Respirators. close by inspiration. The first-mentioned valve or valves being for the inlet or inspiration of air are placed directly in communication with one end of a tube or other conductor of suitable shape and material, the other end of which terminates in the fresh or pure air surrounding or without the confined position in which the operations are being carried 5 on. The air for inspiration is thus drawn entirely from the pure atmosphere, and no apparatus or chemicals of any description are required for its filtration or purification. The second mentioned valve or valves being for the purpose of expiration only require no pipe or other conductor, the expired air or breath passing into the impure or 10 noxious atmosphere in the said confined position. The said bag, mask, or covering may be constructed to cover and protect the eyes for situations where the nature of the impurity in the contained atmosphere renders it necessary by carrying the material of which the said bag, mask, or covering is composed to a sufficient height and of suitable 15 conformation, and fixing therein glasses in the required position. By the aid of such an apparatus as above described gyles and other like vessels at breweries and elsewhere may be entered while full of carbonic acid or other gas for cleaning and other purposes, a considerable saving of time thus often being effected and a large amount of danger 20 and inconvenience being averted and prevented from those whose business it is to cleanse or otherwise labour in such vessels. LONDON: Printed by George Edward Eyre and William Spottiswoode,