having received any rain or dew. If in this ftate they should be laid, the external part of the brick will de prive the mortar of all the moisture which contams the cement, and the brick is very readily moved from its place. A quantity of water therefore must be thrown on to put them in fuch a flate as will give the time ne ceffary to form the union. In the falk months this attention is not wanted, but one of a different kind: which is, to keep them covered and prevent their contracting too much wet and moisture. In the winter months bricks fhould always be kept dry If they are laid when frozen, the work will be always bad and the mortar will turn out of the joint the (pring following. In the year 1764 a brick building was erected in the winter months, when the weather was extreme cold, and is esteemed as good brick work as any in the metropolis (notwithstand. ing it would not be advifeable without neceffity to erect brick buildings in the winter.) The bricks for this buil ing were taken out of a kiln made in Brookline and carted in fair weather and carefully taken out of the cart by hand and put into a clofe hed made for the purpofe near to the building to be erected the mortar was made with lime and fand as above defcribed and ufed HOT. The bricks being deprived of the fun, the furrounding air was fufficient to keep them in a proper flate for laying. The bricks were laid quick and immediately jontered; and although the mortar was brought hot from the cellar where it was made,in fmall quantities, it foon roze dry, and the brick and mortar were very foon infeperable. The lime for this work must be exceeding good and fet a flaking with hot water. If the lime is old and not well burnt and too much cold water thrown on, only a part of the lime. will flack immediately, and a part break into fmall particles and flick a confiderable time after the bricks have been laid; which is not uncom mon in mortar made in winter... (To be continued.) Explanation of Plate 2d. N our Magazine for June, page 321, we gave an account of an experiment made with the Aeroftatic Machine, on the 10th of September, in the prefence of the King, Queen and French Court. We then mentioned, that the "Balloon was 57 feet high, and 41 in diameter. And that its power of afcenfion, allowing for a wicker cage, containing a sheep, a cock, and a duck, which was fufpended to it, was equal to 696 lb " We now have it in dur power to give the reader a fir king reprefentation of this ingenious experiment. This plate exhibits the afcent of the balloon, the sheep, the cock and the duck fufpended in the air, and the admiration of all the fpectators. WE likewife prefent our readers with a further account of the progreís of Aerial Navigation, taken from the Monthly Review for March laft, continued from page 324, Viz. IX. brilliant fucceffes of the Parifian Aeronauts, gave no doubt fome countenance to the confidence of one of the original inventors (the elder Montgolfier) who unballoon t of an immenfe fize, with dertook to confirut at Lyons, a fire which, if he did not actually engage, it was at least given out by his friends, that he propofed to afcend himself, and eight more perfons, with a confiderable cargo of goods, and to per form a voyage of no lefs a diftance than either Paris or Marseilles, according as the wind fhould ferve. A fubfcription was opened for this purpose, which foon filled, and raised 1801. The balloon was formed of double canvas, enclosing three layers of As every new fcience requires a new nomenclature, we beg leave, for the future, to diftinguish the globes fwelled by heat by the name of fire balloons, and thofe filled with inflammable air by that of Gas balloons. We fhail foon have to fpeak of Laing balloons. having received any rain or dew. If in this Rate they should be laid, the external part of the brick will de prive the mortar of all the moifture which contams the cement, and the brick is very readily moved from its place. A quantity of water therefore must be thrown on to put them in fuch a state as will give the time ne ceffary to form the union. In the fall months this attention is not winted, but one of a different kind which is to keep them covered and prevent their contracting too much wet and moisture. In the winter months bricks, fhould always be kept dry If they are laid when frozen, the work will be always bad and the mortar will turn out of the joint the (pring following. In the year 1764 a brick building was erected in the winter months, when the weather was extreme cold,... and is esteemed as good brick work as any in the metropolis (notwithstand. ing it would not be advifeable without neceffity to erect brick buildings in the winter.)The bricks for this bul ing were taken out of a kiln made in Brookline and carted in fair weather and carefully taken out of the cart by hand and put into a clofe fed made for the purpofe near to the building to be erected: the mortar was made with lime and fand as above defcribed and ufed HOT. The bricks being deprived of the fun, the furrounding air was fufficient to keep them in a proper ftate for laying. The bricks were laid quick and immediately jountered; and although the mortar was brought hot from the cellar where it was made,in fmall quantities, it foon roze dry, and the brick and mortar were very foon infeperable. The lime for this work must be exceeding good and fet a flaking with hot water. If the lime is old and not well burnt and too much cold water thrown on, only a part of the lime... will flick immediately, and a part break into fmall particles and flicka confiderable time after the bricks have been laid; which is not uncommon in mortar made in winter. (To be continued.) I Explanation of Plate 2d. N our Magazine for June, page 321, we gave an account of an experiment made with the Aeroftatic Machine, on the 10th of September, in the prefence of the King, Queen and French Court. We then mentioned, that the "Balloon was 57 feet high, and 41 in diameter. And that its power of afcenfion, allowing for a wicker cage, containing a sheep, a cock, and a duck, which was fufpended to it, was equal to 696 lb " We now have it in our power to give the reader a fir king reprefentation of this ingenious experiment. This plate exhibits the afcent of the balloon, the fheep, the cock and the duck fufpended in the air, and the admiration of all the fpectators. WE likewife prefent our readers with a further account of the progreís of Aerial Navigation, taken from the Monthly Review for March laft, continued from page 324, Viz. IX. THE brilliant fucceffes of the Parifian Aeronauts, gave no doubt fome coctenance to the confidence of one of the original inventots (the elder Montgolfier) who unballoon t of an immenfe fize, with dertook to confirut at Lyons, a fire which, if he did not actually engage, it was at least given out by his friends, and eight more perfons, with a conthat he propofed to afcend himself, fiderable cargo of goods, and to perform a voyage of no lefs a distance than either Paris or Marseilles, according as the wind fhould ferve. A fubfcription was opened for this purpose, which foon filled, and raised 180l. The balloon was formed of double canvas, enclosing three layers of * As every new fcience requires a new nomenclature, we beg leave, for the future, to diftinguish the globes fwelled by heat by the name of fire balloons, and thofe filled with inflammable air by that of Gas balloons. We fhail foon have to fpeak of Laing balloons. of paper. The upper part was afterwards, at the defire of Pilatre de Rozier, changed into a fimple cotton cloth. It measured 126 feet in height, and 100 feet tranfverfely, and we ghed about 8000 lb. It received its name from M. de Fleffelles, the intendant of Lyons, a great promotes of the enterprize; and Pilatre de Rozier, the modern Dædalus, from whom we devoutly deprecate the fate of Icarus, was appointed captain of the expedition. Of the number who eagerly folicited to be of the crew, the following were enlifted: M. Montgolfier,fen. the eldest fon of the prince of Ligne, the Counts d'Anglefort, Laurencin, and Dampiere, and M. Fontaine. The departure had been announced for the 10th of January laft; and in fact, all being ready, an attempt was made to `fwell the globe; but whether from the crowding of 100,000 fpectators who had flocked to the spot from 100 miles round, whether from the inclemency of the weather, or from fome fault in the construction, the defired obje& was not obtained, the globe (welling only partially. Repeated trials were made during feveal fucceffive days, but they always failed'; and in one of them, the fire having been confiderably increafed, part of the canvas and cloth were burnt. Thefe repeated difappointments had fo far difhearted the peopie, that they began to defpair of fuccefs, alid accounts had already reached Paris that the project had been laid afide. The projectors however were not fo eafly daunted. They foon repair. ed the damage occafioned by this and feveral other untoward accidents, and were ready for another effay on The 19th of January. The 100,000 fpectators re-affembled. The feven ravigators afcended the gallery, in fpite of the remonftrances of P. de Rozer, who wished to embark only two or three. The fire was lighted at forty five minutes after two P. M. 1ae globe fwelled in about feventeed minutes, and actually afcended amid the acclamations of the multitude! It fit took its courfe with the wind to the S. W. but fortunately it foon alter turned to the N. E; for had it continued in its firft direction, it would infallibly have dropt into the Rhone. Its greateft elevation was vaguely eftimated at about 500 toises: it floated, fome accounts fay fifteen, and others only five minutes. It then defcended with a velocity that alarmed the fpectators, and alighted in a field not very diftant from the place of its firft departure. This fudden defcent was afcribed to a rent near the top of the machine. None of the navigators were hurt. The crowd arrived in the field: feveral ladies who came in coaches, refigned their places to the adventurers, who entered the town in triumph. Montgolfier and · Rozier appeared in the evening in the box of the Intendant at the play. Nothing could exceed the acclamations with which they were received, which were repeated in parts of the play that had fome diftant allufion to the glory of the day. Laurel wreaths were produced, one of which Madame de Fieffelles placed on the head of Montgolfier,who immediately took it off, and another on that of P. de Rozier; the latter fnatched off his, and placed it on the head of the form er. How M. Montgolfier, who is reprefented as a calm and modeft perfonage, muft have relished this bufthng frolic, we leave to fober minds to conjecture. Some of the other navigators were difcovered in the pit ; Crowns were handed to them, and they were invited into the box of the Tatentdant. A concert fucceeded the play, and the whole night was (pent in terenading, congratulations, and mirth bordering upon madnefs. Notwithstanding thefe extravagant demonftrations, which feem to im ply that the expectations of the people had been fully anfwered, there are, however, accounts which fpeak in far more moderate terms of the fuccefs of the experiment; and fome there are (perhaps the partizans of Charles) who even attempt to throw a ridicule upon the whole. Unprejudiced as we are, we confefs, that although we have collected this nar rative from the be authorities that could be obtained, we are not fatisfied that we have given the exact truth; and indeed, at this diflance, we fear it will fcarce be poffible for us, or |