A method and apparatus for obtaining graphic records of various kinds of movements of the hand and its parts, and enumerating such movements and their combinations / by Francis Warner.

  • Francis Warner
Date:
[1883]
Catalogue details

Licence: Public Domain Mark

Credit: A method and apparatus for obtaining graphic records of various kinds of movements of the hand and its parts, and enumerating such movements and their combinations / by Francis Warner. 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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    bent, flattened or compressed, its capacity is lessened and therefore air is pressed out of it and driven into the tambour with which it is connected. The tubes used are moulded for me by Messrs Warne and Go. of soft red rubber and are 7^- mm. in external diameter, one end of the tube x is pointed and perforated, the other y is closed by a moulded cap (see Fig. I.), and a band moulded on to the top of the cap effects a means of fastening the tube to the finger. These tubes are mounted on a •“ foundation ” of sheet red rubber fixed to the back of the hand, as in Fig. Y. The arrangement represented in Fig. vi. a and b is convenient in the case of adults, in whom the thickness of the finger makes a considerable drag on the upper surface of the tube during flexion. It consists of a pair of moulded caps mounted on a ring, back to back: the septum between the two is divided half way down, and the lower portion is perforated, allowing air to pass from one cap to the other. The band is fastened to the middle of a phalanx, and the finger tube being cut at this point the divided ends are inserted one in each cap. The whole is thus rendered air-tight and the tension on the upper surface of the tube is relieved. The tambours mounted on the frame (Fig. II.) give tracings upon a revolving cylinder, showing the amount, frequency, and coincidence of the various movements. The electrical signals indicate (1) time in seconds, (2) the opening of a dark lantern throwing light upon the subject of experimentation, (3) the period during which an electrical bell is ringing, (4) signals the time at which events occur as recorded in the notes of the experiment. The electrical contact-making tambour is represented in Fig. ill. Across the ordinary shell of a Marey tambour a main bracket ad is fixed, to which three smaller ones are screwed, having holes in them to take two arbors. One arbor b has a beam d, e, with a small weight at one end e, and is connected by a short link with the india-rubber head of the tambour. To the other arbor c a block of ebonite is fixed to insulate two wires f,g with platinum ends which lie under and nearly touch the beam d, e. Each of these wires is connected with terminals li and i by a coil of thin copper wire. A light bent blade spring is inserted between the ebonite block and the bracket to resist the motion of the arbor c. The beam d, e has platinum soldered on the part where the platinum ends of the wires are to touch. A terminal k is fixed to the main bracket. Increase of air pressure in the tambour raises one end of the beam e and depresses the other d, which thus comes in contact with
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