Lessons in practical hygiene for use in schools / by Alice Ravenhill ; with preface by M.E. Sadler.

  • Alice Ravenhill
Date:
[1907]
Catalogue details

Licence: In copyright

Credit: Lessons in practical hygiene for use in schools / by Alice Ravenhill ; with preface by M.E. Sadler. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    (C) Lay the hands lightly on the chest, count the number of respirations in a minute, (1) when at rest, (2) after rapid exercise. (D) Pass a tape measure round the chest just under the arms and record your measurements (1) when breathing naturally, (2) after a full inspiration, (8) after a forced expiration. What do the results indicate ? Note.—It will be advisable to repeat (D) several times in order to secure an accurate average, as excitement and inexperience will probably vitiate the first trials. In an adult, the differ- ence between (2) and (3) should be at least three inches, though this depends largely on physical development and judicious training. II.—Demonstration to Illustrate the Vertical Enlarge- ment of the Thorax. Materials : Elastic rubber tissue; rubber-bands: toij rubber balloon; rubber tubing. Apparatus: Lar<je lamp chimney or bell-jar; rubber cork ivith 2 Jioles; ■pinch-coclc. Take a large lamp chimney or bell-jar. Make the lower and larger end air-tight by covering it with a piece of elastic rubber tissue, held in place by a firm rubber-band. The experiment is more conveniently performed if the piece of rubber tissue be cut of a sufficient size to allow a small marble to be first tied pudding fashion into its centre, before it is stretched over the bottom of the lamp chimney or bell-jar. Fit two pieces of glass tubing («) and [b), bent at right angles, into a rubber cork, which must accurately fit the upper end of the lamp chimney or bell-jar; (a) should extend to the middle of the chimney, and must have a toy rubber bladder firmly attached to the lower end ; (i) should only extend slightly below the cork. Fix a short length of rubber tubing to the external opening of (i). When the apparatus is fitted up, partially exhaust the air in the vessel by sucking, and quickly close [b] with a pinch-cock. The pressure of the atmosphere outside the
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