OSTATION, Hiscroar of This at is Coaled an the principk, that any body which is specifically .•1ner than the armee spheric air will be board up by it and mead; a pried* which had desdoacie Lon teen koala, aklanglt the appfication of it to any practical parpose s altogether a modern Ma tint It n tram that we read of the attnapt which was made hg raising and his run Ica ras .unfi the air by antes of artifi cial in which the farmer is said to hare bin this is commonly reckoned among the Wks of the eathertz. Black. in Isis lama:a in 1767 and 1765, win the fuel who, after Mr. Carreneades theorem of the specific gravity of imihannalie air, threw out the seceason that if a bladder, sathneady fight and thus, were Oki with air, it amok firm a salsa fighter than the same balk of at napherie air, and rime in it Bat want of leisure prere&ed his from I** the experi ment, the lima of which Monger:1 to Mr. Cavallo, who communicated the nab to the Ray-al Society, an the 211th of Joe is thaw tam After haring made general unsuccera lid experiments with bladders and skim, he succeeded & length in makiag soap balls, which loin inbred with inilareable sir, by dipping the end of a loath glees tale, meat ed Stith a bladder containisq the air, into a thick !dation of soap, and gently compress*:q the bladder, waded repay_ These were the fir* sort of iadammaik air babas that wer0 nude. But while plulcs.whees in Britrie were thus annul expermam an this sub-1 ject, two brothers, in Preece, Stephen aff John Mookoilikr, paper manufactstrers of .t.n-1 way, beewave rapid adrances towards car rying the peek' ct into acacia& Their idea was to form am artificial cloud Iv enclosh*" smoke in a fete silk bag; and ton:iim applied bunting paper to an aperture at the trawl the or thus became rarefied, wad the taa as-1 moiled to the height of TO i i Ibis nat was mak at Arta', about the middle of the year 174 and was followed by other experams, of affeng to genre the practica bility of the scheme_ An Mame bg of ham, hoed with. piper, wale of 23,000 ethic fiset, as foal to late a pourer rehiring about 500 woods, its own weight. Baraine chopped s=1 wool achy the aperture tette minthine caused it to swill aid amend in the spine of ten sautes to the heieht of 6000 feet= when crInested, it it to the grazed at the eboace I of same thousand feet from die pia where it ascended. Las expellant tried before the Academy re Sciences, a large balloon was made to edi eLrht persons Ira the maid, who winkd hare ben earned asap Lad the machine Ilea bens kept down with farce. Oa the repetition of the experiment before the Trier, with a hallo* near 60 feet high mod 43 in diameter, a sheep, a cock, and a deck, the first maids slat ewer wiled in a bal loon, were carried up shoot 1440 fed, and after rentaisieg in the air about eight ammo% came to the ground in perfect safety, & the distance of 10,530 feet from the place of art& Ene aliened by .ampetimeat,X nab* de Raeder &fared himself to be the font aerial ad reatunx. Ants machine was accordinglyI prepared, with a gallery and grate, de. to enable the pecanwasher to supply the fire with fad, and thin keep up the saanha as bete as be plowed. On the 15th of October,
17M, M. ['awe took his at in the gallery, and, the nsachine bin iodated, be nose to the bekdet. of S4 feet, mad, air keepMg at afloat about tour min' wen and a hal( be gently de scended: he then rose &rain so the laraght of 210 fed, and the third tiae to 262 In the deice& a gut of wad kania Mown the ma chine ewer am bate trees, M. nacre extri cated himself by derenrian straw and wad on the fire, which raised him at oat° a aficient height, and in this suoreer be found himself able to aend or deand to a certain beitht. at 131(11011111re. SMD? time after, he aseendedwith 1 AL Girona de Vila to the bright of 330 fat, homing over Paris at kart Mime minutea, in skid of all the irthabintots, and the machine keeping all the whfie a sway patios. In he awlertook a &id aerial voyage with the d'Arbades, and in the space of twenty-fire mates weal about fire male& la this any they met with several different currents or air, the effect of which to tire a very walk sleek to the machine. Tali. were also in singer of harit the machine bend ahozether, if the fire had net beret quick ly exiles-earthed by means of a spotge. After din p-xixi aerostatic machines were derma by ialbenable air eackerel, instead of fire, with which Mare. Roberts and Charles male the first experiment. In this cane thetas was oonap-sed of harestring, yarniehed vier wide a solution of filmic elm, called caschooc, and was gat :3 English feet in thater. Aber being filled with considerable difficulty, it was found to be 35 pounds lighter than an equal bulk of common air. With this they ascended, and in three quarters of an hour traversed fifteen miles. Their sudden descent was occa sioned by a rupture which happened to the ma chine when it was at its greatest height. On a subsequent day the same gentlemen made an ascent in a balloon filled with inflammable air. This machine was formed of gores of silk, covered with a varnish of caoutchouc, of a spherical figure, and measuring 27 feet 6 inch. es in diameter. A net was spread over the upper hemisphere, and fastened to a hoop which passed round the middle of the balloon. To this a sort of car was suspended, a few feet below the lower part of the balloon ; and in or der to prevent the bursting of the machine, a valve was placed in it, by opening of which some of the inflammable air might be allowed to escape. In the car, which was of basket work, and covered with linen, the two adven turers took their seats in the afternoon of the 1st of December, 1783. At the time the bal loon rose the barometer was at 30° 18/, and It continued rising until the barometer fell to 27°, from which they calculated that they had ascended 600 yards. By throwing out ballast occasionally they found it practica ble to keep nearly the same distance from the earthduring the restof their voyage, the mercu ry fluctuating between 27° and 27° 65/, andthe thermometer between 53° and 67° the whole time. They continued in the air an hour and three quarters, and alighted at the distance of 27 miles from Paris, having suffered no incon venience, nor experienced any of the contrary currents described by the Marquis d'Arlandes.