An inquiry into the physiological mechanism of respiration : with especial reference to the movements of the vertebral column and diaphragm / by J.F. Halls Dally.

  • Dally, John Frederick Halls, 1877-1944.
Date:
[1909]
Catalogue details

Licence: In copyright

Credit: An inquiry into the physiological mechanism of respiration : with especial reference to the movements of the vertebral column and diaphragm / by J.F. Halls Dally. 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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    !)4 IF. Halls Dally (lei-iyed IVoin tlio, us(^ ol' an instrument called the orthodia^n-aph, of which a detailed description has already been puhlisluid.' by means ol this instrument it is possible, with almost mathematical accuracy, to measure motionless objects which lie in a ])lane parallel with the Jb -V V Fig. 1. vertical transverse plane of the body, and to measure moving objects with greater approximation to exactitude than can be attained in any other manner. The explanation is as follows:— In a fluorescent tube, when the electrons shot off from the kathode suddenly are intercepted by the antikathode, they set up electric vibra- tions in the ether precisely similar to those of light, save that their wave- lengths are much shorter. By cutting oft’ all the rays projected from the antikathode, with the exception of the central pencil, and by conducting this latter round the shadow-margin of an organ, irrespectively of the 1 British Medical Joxmial, Sept. 14, 1907, p. 651.