Specification of John Henry Johnson : artificial legs and feet.

  • Johnson, John Henry.
Date:
1858
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Henry Johnson : artificial legs and feet. Source: Wellcome Collection.

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    Specification. Johnsons Improvements in the Construction of Artificial Legs and Feet. in combination with a universal or ball-and-socket joint; these two sets of cords and springs operate antagonistically to each other, one set being placed on each side of the ball-and-socket joint; hence it is obvious that a perfectly universal fluxion of the foot is obtained in any direction. The springs used serve as muscles, and are made of india-rubber tubes, whilst the cords serve 5 as sinews, and are so connected to the springs as to be capable of adjustment by nuts and screws, so that their tension may be regulated with the greatest nicety. Cords and india-rubber springs are also employed for connecting the toe or point of the foot to the body, so as to allow of free play at that part when required. 10 SPECIFICATION in pursuance of the conditions of the Letters Patent, filed by the said John Henry Johnson in the Great Seal Patent Office on the 16th November 1858. TO ALL TO WHOM THESE PRESENTS SHALL COME, I, John Henry Johnson, of 47, Lincoln’s Inn Fields, in the County of Middlesex, 15 and of 166, Buchanan Street, in the City of Glasgow, North Britain, Gentle¬ man, send greeting. WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters Patent, bearing date the Seventeenth day of^ May, in the year of our Lord One thousand eight hundred and fifty-eight, in the twenty-first year of Her 20 reign, did, for Herself, Her heirs and successors, give and grant unto me, the said John Henry Johnson, Her special license that I, the said John Henry Johnson, my executors, administrators, and assigns, or such others as I, the said John Henry Johnson, my executors, administrators, or assigns, should at any time agree with, and no others, from time to time and at all 25 times thereafter during the term therein expressed, should and lawfully might make, use, exercise, and vend, within the United Kingdom of Great Britain and Ireland, the Channel Islands, and Isle of Man, an Invention for 46 Improve¬ ments in the Construction op Artificial Legs and Feet,” (a communication from Douglas Bly, of Rochester, in the United States of America,) upon the 30 condition (amongst others) that I, the said John Henry Johnson, by an instrument in writing under my hand and seal, should particularly describe and ascertain the nature of the said Invention, and in what manner the same was to be performed, and cause the same to be filed in the Great Seal Patent Office within six calendar months next and immediately after the date of the 35 sfiid Letters Patent.