102 GOODYEAR ON GUM -ELASTIC. 



JAR CORKS 



The foregoing descz'iption may be applied also, in general, to 

 jar corks, except that it may be found economical to manufac- 

 ture them, and also some of the larger kinds of those already 

 described, by filling the interior of the cork with light v/ood, 

 refuse cork wood, or other light substances. 



Common jar corks being so much larger, ai'e usually more de- 

 fective, and for them there is the more need of improvement in 

 the article. 



DEMIJOHN CORKS. 



It has been the practice of manufacturers of acid to use clay 

 stoppers for demijohns of acid, which answer a tolerable purpose 

 until the clay is once loosened, after which the druggist and the 

 consumer have no safe and convenient method of corking up the 

 acid, except by resorting to expensive bottles with ground stop- 

 pers. It may be expected that these corks will remedy this 

 deficiency. 



INFLATING CORK. 



This is a cork made with tone of the self-acting valve tubes 

 connected with it, so that the gum-elastic bottles and tanks may 

 be inflated without difficulty, and used as life-preservers ; and 

 also that liquids may be drank or drawn from them without taking 

 out the cork or bung. This is done by means of a pipe of vulcan- 

 ized gum-elastic, or any other suitable material, which may be 

 looped to the cork or bung. It has been found somewhat difH- 



c^?^ 



