A contribution to the study of the mechanism of respiration : with especial reference to the action of the vertebral column and diaphragm / by J.F. Halls Dally ; communicated by T. Clifford Allbutt.
- Dally, John Frederick Halls, 1877-1944.
- Date:
- [1908]
Licence: In copyright
Credit: A contribution to the study of the mechanism of respiration : with especial reference to the action of the vertebral column and diaphragm / by J.F. Halls Dally ; communicated by T. Clifford Allbutt. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![s. 3* v [Repinted from the PRQ&SJ folNGS OF THE RqYAL SOCIETY, B. Yol. 80] A Contribution to the Study nfHhe/yfephanism of Respiration, with Especial Refenm^ ^ t^,. fAey Action of the Vertebral Column and Diaphragm. By J. F. Halls Hally, M.A., M.D. Cantab. (Communicated by Professor Sir T. Clifford Allbutt, K.C.B., F.R.S. Received January 24,—Read February 6, 1908.) In studying the alterations which occur in the shape, size, and position of the internal organs as the result of their functional activity, previous observers have worked at a disadvantage. During the past nine years X-rays methods, though indicating an advance in our knowledge of abdominal and thoracic visceral movements, have not been of absolute utility, since the rays, being divergent, produce magnification of the shadow of the object. Hence, exact measurements have been unattainable. In the present investigation the chief results have been obtained by means of Groedel’s orthodiagraph, which Dr. Hugh Walsham and myself have been the first, to our knowledge, to work with in this country, and of which we have already published a detailed description.* By means of this instrument it is possible, with almost mathematical accuracy, to measure motionless objects which lie in a plane parallel with the vertical transverse plane of the body, and to measure moving objects with greater approach to exactitude than can be obtained in any other manner. Summary of the Results of the Investigation. I. Results obtained by Orthodiayraphic Measurement of Changes in the Trunk which occur during Respiration. One hundred healthy subjects, of ages varying between 15 and 35, were examined, the average measurements being recorded as follows :— (1) The neck is shortened 10 mm., and widened, on the right side 9 mm., on the left side 7 mm. (2) The shoulders are raised on the right side to a greater extent than on the left, the average on the right being 16 mm., that on the left 14 mm. (3) The presternum moves 30 mm. in an upward, and 14 mm. in a forward, diameter. (4) The clavicles execute a combined upward, forward, and outward * ‘ Brit. Med. Journ.,’ September 14, 1907, p. 651. b](https://iiif.wellcomecollection.org/image/b22410193_0005.jp2/full/800%2C/0/default.jpg)
