New Patents. 69 



change of weather, when the barometer rises or falls rapidly. One 

 remarkable observation which Dr. Forster made, was, that on the 

 occasion of descents from mountains, the deafness felt has always 

 been accompanied by a sense of fullness about the ears ; but this 

 very unpleasant accompaniment of the difficulty of hearing was not 

 felt after the descent from the balloon ; the deafness in the latter case 

 being simply dullness of hearing. In both cases it soon goes off. 

 The sensation which is experienced when up in the higher regions 

 of the air is not actually deafness, but a snapping in the ears; 

 which goes off as one begins to descend ; and the deafness which 

 comes on in descending still lower, and which is worse on arriving 

 at the ground, seems to be a sort of counterpart to the sensation ex- 

 perienced aloft. This very curious subject deserves further investi- 

 gation. 



With respect to giddiness and the fear of any danger from the 

 sudden falling of the balloon, Dr.Forster observes, that having been 

 accustomed to mount to very great altitudes, he felt neither of 

 these disagreeable annoyances; but observed that on looking directly 

 down, at the grapple hanging below, and on the ground beneath, 

 he felt a disagreeable sensation, scarcely amounting to vertigo ; but 

 such as would have become so in persons not accustomed to great 

 heights ; and he therefore recommends aerial travellers to keep 

 their eyes on the horizon rather than the ground directly below 

 them, particularly if the car be large enough to admit of the choice. 



The basket in which Dr. Forster ascended was a small one con- 

 structed for the purpose of lightness ; but he is constructing a light 

 circular willow basket capable of holding a proper set of instru- 

 ments, in order to be ready, should a fit opi)ortunity for another 

 ascent occur. 



P.S. Two parhelia were seen at five o'clock on Monday evening. 

 May 9th, at Chelmsford. 



LIST OF NEW PATENTS. 



To J. Revere, Weybridge, Surrey, doctor of medicine, for a new 

 and improved method of protecting iron chain cables, iron boilers, 

 and iron tanks, from the corrosion produced on them by the ac- 

 tion of water. — 27th of November.— '2 months allowed to enrol spe- 

 cification. 



To W. Church, of Haywood House, Warwickshire, esq., for certain 

 improvements in apparatus applicable to propelling boats and driving 

 machinery by the agency of steam, parts of which improvements are 

 also applicable to the purposes of evaporation. — 29th of November, 

 — G months. 



To K. Dalglish, junior, Glasgow, calico-printer, for improve- 

 ments in machinery or apparatus for printing calicos and other 

 fabrics.— 6th of Decenibcr — G nionihs. 



To H, lilinidell, Kingston-upon-IIull, merchant, for ini[)rovc- 

 mcnts in a machine for grinding or irusliing seeds and other olea- 

 ginous 



