Specification of John Henry Johnson : apparatus for preventing sea sickness.

  • Johnson, John Henry.
Date:
1864
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Henry Johnson : apparatus for preventing sea sickness. Source: Wellcome Collection.

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    A.D. 1863.—N° 1953. Specification. ' ' ' • ' ■ —- • ■>. Johnson s Improvements in Apparatus for Preventing Sea Sickness. of rest. This objection applies still more forcibly to the horizontal springs for preventing lateral oscillations in the platform. In order to obviate these objections, and still maintain the same principle in the application of the springs, it is proposed to adopt the modification shown in Figure 2, in which A represents the blade springs, which are bent by the 5 action of the short arms of the levers b, c, on the two ends of the springs. These levers work on fulcra d fixed to each corner of a double frame e, which bears the strain of the springs and of the suspended weight, and prevents by means of suitable stops the undue flexure of the springs. The load to be sus¬ pended is attached at c, and consequently the elastic play is increased in pro- 10 portion to the length of the levers. It is advisable that the spring blades should present an equal resistance throughout, as it is important to reduce their weight to a minimum, as well as the weight of their accessories. By placing several pairs of these springs and their levers one above the other the desired amount of play will be obtained, and by placing others on the side of 15 the former springs the desired strength or resistance for supporting the weight of the platform and its occupants will be afforded should this strength not be obtained from a single series of springs. It is preferred to tie together the several series by transverse bars placed at each end of the frames at /, so ihat in case of any of the springs in one series breaking, the whole may still 20 remain supported. Allowance should also be made for the weight of each pair of springs and their levers, the upper springs being rather stronger than the pair below in proportion to the additional weight of the lower springs and levers which they have to carry. Figure 3 represents the combination of several series of springs and levers 25* which carry the platform suspended at o by a universal joint, and which plat¬ form is guided laterally by two vertical stays or masts m passing through the guides n with or without rollers at the extremity of the bar p, which connects the several pairs of springs. The platform may either be suspended above the deck, as shown, and approached by a light bridge or gangway resting upon 30 a fixed, flight of steps, or it may be suspended so as to be level or nearly level with the deck, in which case a well must be formed to receive the platform when the hull of the vessel rises. Having now described and particularly ascertained the nature of the said Invention, and the manner in which the same is or may be used or carried 35 into effect, I would observe, in conclusion, that what I 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 general construction,