Various Jm-^ 

 provemcnts in 

 Read's funnel 

 apparatus. 



Q BAGATELLES RELATING TO THE PNEUMATIC APPARATUS, 



delineated Fig. 2. ABC are the parts correfponding to thofe 

 of the preceding. It ferves as a connecting piece, to which 

 tubes at D and H may be joined in the requifite directions. 

 Its conftruction and advantages are fufficiently obvious from the 

 mere infpeclion of the drawing, fo that nothing is requifite to 

 be added on this account. Several friends had made it after 

 this model, and highly recommend its ufe : and fince the 

 making of it the writer underftands that the ingenious Mr. 

 Webfter, whofe merits were never properly eftimated by the 

 great improver of culinary utenfils, had the fame thought, and 

 executed it about two years ago ; he, therefore, does not claim 

 the merit of its firft invention, but only (perhaps) that of pub- 

 liming it. 



The Aiding ftop-cocks, § 1, as well as thefe connecting 

 pieces, § 2, have been executed in a mafterly manner by Mr. 

 Hooke, optician and mathematical inftrument maker, No. 159, 

 Fleet-ftreet. 



§ 3. In Mr. Read's very fimple and cheap pneumatic appa- 

 ratus (fee Nicholfon's Journal, new feries, Vol. III. page 55) 

 two improvements have fince been made. The firft, that the 

 top of the exterior tube is not foldered to the funnel I (Plate 

 IV. cit.J but has a top fcrewed on with a collar of leathers, 

 and the upper part of the innerraoft tube A F projects above it 

 If inch, and receives the brafs cylindrical end of the funnel, 

 fitted to it by grinding. The fecond improvement has been 

 made by Mr. Hooke, who inftead of foldering all the parts to- 

 gether, has joined the interior parts to the outer tube A A, 

 in the middle about E. By thefe means, if any impurities that 

 might impede the action of the inflrument, fhould happen to 

 fettle at the bottom C or D, or at L, the whole may be eafily 

 taken afunder and cleaned. 



§ 4. The whole chemical world fpeaks, hears, and writes 

 ratus was invent- of Woulfe's pneumatic apparatus. The tribute of merit mutt 

 e y au er » n0 £ De denied to Mr. Woulfe ; but perhaps it may be curious 

 to know, that the original invention of this contrivance, in the 

 ftri6t fenfe, belongs to good honeft father John Rudolph 

 Glauber. If any gentleman doubt of this fa^t, let him confult 

 Glauber's works, tranflated into Englifh by Chriftopher Packe, 

 and printed, Lond. 1689, in folio, for the tranflalor, by Thomas 

 Milbourn. The very firft plate to Glauber's Treatife on Pru> 

 lofophical Furnaces fhews it, Fig. 3. 



§ 5. An- 



Woulfe's appa- 



