. Transactions of the American Philosophical Society. d depressedbelow la surface du mercure ; l'wholebeing charge comme représenté dans la figure. Dans ces circonstances, le mercure monte comme la température de l'eau diminue, indiquant la réduction importante de la pression dans l'ampoule.Pendant ce temps, le déclin de l'abaissement de la pression au point d'ébullition du lavis, l'ébullition continue jusqu'à ce que le mercure monte dans le col nearlyto la hauteur du mercure dans le baromètre. En introduisant dans la cuvette formée par le renflement de l'ampoule, Coldwater, alcool, éther ou de glace, l'refri

• Contributeur: The Reading Room / Alamy Banque D'Images
• ID de l’image: 2AFW8J8
• Taille du fichier: 7,2 MB (263,5 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1075 x 2325 px | 18,2 x 39,4 cm | 7,2 x 15,5 inches | 150dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. Transactions of the American Philosophical Society. d depressedbelow the surface of the mercury; the wholebeing supported as represented in the figure. Under these circum-stances, the mercury rises as the temperature of the water declines, indicating the consequent diminution of pressure within the bulb.Meanwhile, the decline of pressure lowering the boiling point of thewater, the ebullition continues till the mercury rises in the neck nearlyto the height of the mercury in the barometer. By introducing into the cup formed by the bulging of the bulb, coldwater, alcohol, ether or ice, the refrigeration, the diminution of pres-sure, and the ebullition are all simultaneously accelerated, since theseresults are reciprocally dependent on each other. The advantage of this apparatus and method of operating, lies first in the certainty and facility with which the apparatus is secured against the access of the atmosphere; and in the next place, in the index of the diminishing resistance, afforded by the rise of the mercurial column. vol. v.—5 c. 402 SUNDRY IMPROVEMENTS IN HYDRO-PNEUMATIC CISTERN. Fig. 1. In Sillimans Journal will be found an engraving and descrip-tion of a pneumatic cistern, which I employed in the experimentalillustrations of my lectures for more than ten years; and which I shouldprobably continue to use now, had not the command of water from thepublic works, put it into my power to dispense with the mechanismfor keeping the water at a proper level. As I am now situated, anydeficit of water is easily supplied from the pipes known here as thehydrant pipes, by which the city is supplied with water; and any ex-cess is carried off by a waste pipe. Many chemists designate as apneumatic trough or tub, apparatus for the purposes to which that inquestion is applied. Neither of these names is, in my opinion, as ap-plicable to the apparatus which I have hitherto used, as that of cistern, to which I resorted; and although the last term be less suitable to theapparatu

Recherche dans la banque de photos par tags

• booksubjectscience