The development of inhalation anaesthesia : with special reference to the years 1846-1900... / [Barbara M. Duncum].
- Duncum, Barbara M.
- Date:
- 1947
Licence: In copyright
Credit: The development of inhalation anaesthesia : with special reference to the years 1846-1900... / [Barbara M. Duncum]. Source: Wellcome Collection.
506/664 page 486
![allow for that originally present in the lungs and blood. . . . The objection to giving pure nitrous oxide itself at the beginning, is that it is sometimes difficult to quickly neutralise the effects thus Fig. 131.—HEWITT'S IMPROVED APPARATUS FOR NITROUS OXIDE AND OXYGEN (1897) It consisted of a carrying bag,' two nitrous oxide cylinders, one oxygen cylinder, a combined stand and union, double india-rubber tubes (one running inside the other) for con- ducting the two gases from the cylinders to the . . . two india-rub ber bags joined together by a septum common to both, a combined regulating stopcock and mixing chamber [see Fig. 132], and a face- piece'. The bags were filled before the patient entered the room and the readily-attachable foot-key was kept on one of the nitrous oxide cylinders during the administration. The foot-key can be seen in the carrying bag. produced without going to the other extreme and administering too much oxygen. After two or three seconds the oxygen indicator may be turned to 3, and in a few seconds more to 4. In children, anaemic subjects, and debilitated persons, the indicator may be moved to 3 and 4 more quickly than in strongly-built or alcoholic individuals. During these manipulations](https://iiif.wellcomecollection.org/image/b20457200_0510.jp2/full/800%2C/0/default.jpg)
