Specification of John Henry Johnson : artificial palates.

  • Johnson, John Henry
Date:
1875
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Henry Johnson : artificial palates. Source: Wellcome Collection.

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    Johnson's Improvements in Artificial Palates. palate is almost entirely wanting it is not necessary to sink or imbed the mechanical parts in the thickness of the mass or body of india- rubber of the palate plate a, the spring/is therefore arranged so as to project from the palate plate, the hinge h, the lever c, the slide d, and 5 the valve e remaining however the same, and being placed in a manner similar to that herein-before described with reference to [Figures 1, 2, and 3. Whatever may be the form and arrangements of the obturator nuts of gold or platinum are inserted at all the parts of the piece of india-rubber, 10 at which fixing or uniting screws are to be placed in order to impart to it perfect firmness at all its points of attachment and joints. Having now described and particularly ascertained the nature of the said Invention, and the manner in which tbe same is or may be used or carried into effect, I would observe in conclusion that what I 15 consider to be novel and original, and therefore claim as the Invention secured to me by the herein-before in part recited Letters Patent is, the employment for defects in or injuries to the velum or curtain of the palate of the peculiar artificial palate or obturator, having its rear portion movable so as to constitute a valve which is fitted and com- 20 bined with the other portions in such a manner as to perform the functions of the natural velum or curtain of the plate, and ensure a clear articulation of the voice, the whole being arranged and operating sub¬ stantially as and for the purposes herein-before described and as illustrated by the accompanying Drawings. 25 In witness whereof, I, the said John Henry Johnson, have to this my Specification set my hand and seal, the Twenty-eighth day of May One thousand eight hundred and seventy-five. J. HENKY JOHNSON, (l.s.) LONDON: Printed by George Edward Eyre and William Spottiswoode, Printers to the Queen's most Excellent Majesty. 1875-
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