Specification of Julius Jeffreys : respirators.

  • Jeffreys, Julius, 1800-1877.
Date:
1856
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Julius Jeffreys : respirators. Source: Wellcome Collection.

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    Jeffreys Improvements in Instruments for Aiding Respiration. are made precisely similar to C, C, and soldered at tlie top and bottom-bends ef e, e, e, to wires a, b ; but tbe coil c, c, is sufficiently less than C, C1, in height and thickness to admit of its being slid completely within the latter coil until the points A and a, B and b are contiguous. In the Figure the coil c, c, is 5 shewn partially introduced into C, C. When it is in situ it is plain that by a slight lateral movement of the inner coil its bars or lines of wire may be made either to fall behind those of the containing coil C, C, so as to leave the aper¬ tures or slits between the vertical lines of the coils open, or the bars of the inner coil c, c9 may lie in the way of the slits, so as to reduce them greatly in 10 width and to double their number. When the coils thus intercept each others spaces, the currents of the breath passing through them are subjected to a greatly increased conductive action, and the power of the instrument is pro- portionably increased. By placing several of these double coils of wire together a complete operative “ packet ” of metal work is formed, of which Figure 9 15 presents an end view. Figure 10 is a slide movement for adjusting all the contained coils c, c, &c. of the “ packet.” T, I, is a plate of metal, attached along its ends to all the stout wire ends 5, b, (cut short) of the contained coils c, c, of the packet. H, H, is a plate, the stapled ends h9 h, h, h, of which enclose I, I, and are fixed on the stout wire ends B, B, of all the containing 20 coils C, C, of the packet. The thumb screw L passes through the screw nut M in H, H, and turns in a swivel joint N in the plate I, I. By turning the screw L the plate I, I, is made to draw or push all the contained coils c, c, laterally within their several containing coils C, C, so as to produce the effect of varying the power of the instrument, as above described. In place of the 25 arrangement of wires, Figures 8 and 9, perforated metal plates may be employed to slide one on the other to accomplish the like object. Figures 6 and 7 represent the operative part of another form of respirator to be worn like a shawl wrapper, Figure 7 being a vertical transverse section of Figure 6 along the line a1, d\ In Figure 6 the shield B, B, is not shown. 30 A, A, A, A, are a series of parallel tubes, about twenty in a row, and four rows deep from front to back at top, but below spread out like a fan, so as to be of forty in the row, and two rows deep, the rows interlaying. Each of the tubes is a cylindrical or somewhat flattened spiral of fine wire, like the article made by gold fringe makers “ bullion ” or “ pearl.” In this instrument the currents 35 of the breath pass longitudinally through the tubes of the coils, the exhaled currents entering the upper orifices of the tubes a, a, and passing out at the lower orifices d, d, and the inhaled current entering at d, d, and passing out of the tubes at a, a, and thence into the mouth of the wearer, the pad b resting against his upper lip and the cloth lining at C1 against his lower lip. B, B,