PLATE XXV.
AN AUBDAR,
OR COOLER' ®E /WATER AND-WINES, BY THE MEANS, OS'- SALT-
. PETRE IN THE STATE' OP DISSOLVING. '
T his is effected by* placing » « v e sse lin in g .e ith eh sv ate r .or winfc
antp a small tub filled with the purest wat&jc^and into. \Vhichi is- thrown
».certain quantityrpfjjsalt-petre; thq^inrntprsed Vessel, is.thert turned
rpupc}jsla\yly untiljt'he s^ltjpetre dissolves, when the cold contained
j n i t superficies explodes, an,d epmpiu^tcates,it^:.quality ,to the contents
pi'the vessel. •
