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Related to'Laryngological Society of London', Journal of Laryngology and Rhinology 13 (3) (1898), pp. 131-144.
Description:'The Position and Condition of the Vocal Lips in the Chest and Head Registers.
Dr. JOBSON HORNE, on behalf of Dr. Musehold, of Berlin, showed a series of photographs of the larynx demonstrating the above conditions. Dr. Home referred to the researches of Dr. Musehold, and drew attention to what he understood from Dr. Musehold to be the more important conclusions which had been arrived at with the help of the stroboscope, and which the photographs demonstrated.
In the chest register it was seen that the glottis is "opened and shut," whereas in the head register it is "widened and narrowed," a difference still more demonstrated with the stroboscope.
The cords themselves in the chest register, and more particularly in the production of loud chest-notes, showed a rounded or tumid form. This was accounted for by the expiratory current of air meeting with an increased resistance, and forcing the cords upwards; and it was the analogy of this condition of the cords with the condition of the lips when applied to the mouth-piece of a trumpet in producing loud notes that suggested the term "vocal lips " in the present instance.
The photographs further showed that the deposition of the mucus secreted on to the cords was along different lines in the two registers; this was attributed to a difference in the manner and intensity of the vibrations.
For a more detailed description of the photographs, and of the photographic apparatus and stroboscope used, Dr. Home referred to Dr. Musehold's paper which had recently appeared in the " Archiv für Laryngologie und Rhinologie."' (131)
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Related toA-M. Bloch, 'Expériences sur la vision', Comptes rendus des séances de la Société de biologie 37 (28) (1885), pp. 493-495.
Description:Raises question of whether or not it is possible to pass a light in front of the eye without it being seen.
Notes that a certain number of physiologists have addressed this question, and that it has finally been answered in the affirmative by M.M. Richet and Bréguet. Considers however that their results are ‘qualitative’, and that it would therefore be desirable to ‘spécifier exactement la durée de l'excitation visuelle, comme aussi l'intensité de cette excitation.’ (493)
Uses Foucault regulator to produce regular movement.
The regulator is combined with a box with slits cut into it, with a candle placed in front. Revolution of the box is measured by the regulator - this allows Bloch to estimate the length of time that the candle is visible for as the slots pass in front of it. Moments of illumination are observed through a metre-long copper tube, the end of which being blocked off except for a 0.5mm-wide pinhole.
Obtains result that duration required for the spark to remain unnoticed is 1/1119th of a second.
Varies brightness of light, duration of passage of slots to determine whether there is a law relating to the relation between intensity of light and speed of rotations needed to make light unnoticeable.
Concludes that ‘pour une lumière double, il faut une durée moitié moindre, si on veut arriver à la cessation de la sensation visuelle.’ (495)
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Related toG. Habermann, 'History Committee Page [Max Joseph Oertel]', Folia Phoniatrica 35 (3-4) (1983), p. 91.
Description:Highlights that Oertel 'can be credited with having tested for the first time the stroboscope for the examination of the vocal folds of living man.'
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Related toK. Marbe, 'Die stroboskopischen Erscheinungen', Philosophische Studien 14 (1898), pp. 376-401.
Description:Reveiws history of disciussion of stroboscopic effect, invention of stroboscopes. [access problems, tbc]
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Related toS. Bidwell, 'On the Recurrent Images Following Visual Impressions', Proceedings of the Royal Society of London 56 (1894), pp. 132-145
Description:Discusses re-appearance of images following bright flashes of light (explosions, etc). Introduces illusion produced by spinning a vaccum tube on its horizontal axis.
Mention of theories of persistence, re-appearance of after-images - note retina- v's nerve-centred explanations.
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