'^7- Description of a Woulf's Apparahjs. 



To William Everhard, baron Van Doornik, of Well- 

 street^ in the county of Middlesex, fur certain compositions 

 fcmned by uniting an absorbent or detergent earth with 

 other ingredient?, so as to render the same more effectual in 

 washing or scouring, and for various purposes, to which 

 soap> and detergent earths arc now applied. 



XLIX. Di'.scription of a JVouIf's ylpparafus, iniikniied ly 

 3ir. J. Knight, of Foster-lunei London*. 



J. HE inconvenience attending the complicated form of the 

 Woulf *s apparatus now in use, is felt by experimental che- 

 mists in (general. Considering, therefor^.', how desirable a 

 thing it would be to render so useful an apparatus more 

 simple, and at the same time preserve all its properties, I 

 have endeavoured to- accomplish it by constructing an ap- 

 paratus agreeably to the following description. How far I 

 have succeeded in my object, the public will be able to 

 judge ; and should it prove useful I shall feci gratified in 

 having contributed to tiro advancement of science. 



AAA (Plale VIT.) represents three vessels, each ground 

 into the mouth of thut below it. 



BBB, glass tubes, the middles of which are ground into 

 the neck, of each vessel, which allows the upper end to rise 

 above the liquor, while the lower descends nearly to the 

 bottonk of the next vessel below. Tlie upper vessel serves 

 as the receiver to catch whatever may come over in a fluid 

 form. 



E, a Welter's tube of safety, to prevent absorption. 



D, the. lowest vessel, has a foot which supports the v;hote 

 apparalu-. The lube C is for the purpose of conducting 

 the gas into a pneumatic trough. 



F, an adapter ground to fit the receivci", to which any 

 retort may be joined and luted before the latter is put into 

 its place. 



In ordi-r to prevent the danger of oversetting the appa- 

 ratus 1 }.la( c it on a square wooden foot, to which the glass 

 one is easily lixed by sliding it in between two grooves. 



By substituting a stopper in place of the adapter this ap- 

 paratus forms a verv complete Nooth's ; the materials bcmg 

 put into the rejcivtr at top. 



• Comuiunicatcd by the Inventor. 



L. Pro- 



