METHOD OF CLOSING WIDE-MOUTHED VESSELS. ^9 



pentine, to which may be added an aqueous folutlon of hy- 

 drargyrus muriatus, or mercury corrofive fublimate in the pro- 

 portion of twenty grains of the latter to a pound of pure water. 



The methods ordinarily adopted for clofingglafs vefTels ufed Ufual methods. 

 for thefe purpofes, have been ground glafs ftoppers, well 

 foaked bladders with a middle plate of thick ftieet lead, to 

 keep the top level, and plates of glafs luted with glaziers 

 putty. 



The objeflions to thefe methods are found by experience to Objeftions to 

 be fufficient to induce the trial of others. The ground glafs ^^"^^ feveraJly. 

 floppers are feldom air-tight, but when they are, it happens 

 that by the accumulating of particles of duft in the fitting, the 

 flopper becomes in a few years immoveable. Where oil of 

 turpentine is employed, the flopper becomes fixed by hardened 

 turpentine. The flopping with bladders and fheet lead is li- 

 able to fuch repeated changes of prefTure within and without, 

 by the alterations in the expanfion of the contained liquids from 

 variations of temperature ; that the cohefion of the bladders 

 are eventually deftroyed ; add to this, that fuch preparations 

 cannot be taken out of the vefiels for examination, or the li- 

 quor renewed, without the trouble of a new flopping. The 

 plate of glafs with putty is feldom air tight, but when it is fo, 

 the flopping is liable to the fame objedion which was flated 

 laftly againft the bladders. 



The method I have now adopted, is to have a glafs jar with N^fw method by 

 a groove half an inch deep round the outfide of the top or q/ ^hj^l^ g^g 

 mouth, and a glafs lid, like that ufed by confedioners in their into a groove 

 fliow glafies, the lid fitting loofely into the groove is rendered ^'' ,*°^ * " ' 

 air tight by hog's lard, a fubftance never quite fluid at the 

 higheft temperature of this climate, and always foft enough in 

 the cold feafon to admit of removing the lid or top. 



The firfl: glafs of this kind was made to my order by Mr, 

 Parker in Fleet- llreet, to contain twenty ounce meafures of 

 water, and the coft was five fliillings. A fimilar adjuftment 

 for the Hds of earthen jars, to contain pickles, preferves, &c, 

 feeras both eligible and eafy in practice. See Plate V. Fig. 2. 

 I am. 



Dear Sik, 



Your obliged Friend, 



A. CARLISLE. 

 Soho'Square. 



Extract 



