55 



XIII. 



Defer iption of Mr. Read's Pneumatic Apparatus, By a 

 Correfpondent. 



To Mr. NICHOLSON. 

 SIR, 



J. BEG leave to recommend to your notice a very fimple and Notice of a very 

 •cheap apparatus for difplacing any elaftic fluid out of a refer- f^?if a cafes. atUS 

 voir by means of water. It is defcribed in Dr. Beddoes's Con- 

 ^derations on the Medicinal Ufe of Fa&itious Airs, octavo, 

 London, 1796; and I hope you will think with me, that it de- 

 fer ves a corner in your refpe&able publication. 



I is a funnel with its pipe or tube (topped at B, and perfo- Defcription. 

 rated above and below with two or three fmall holes. Round 

 the tube A is foldered the tube D, left open at top. The tube 

 G is made to circumfcribe the tube D, and to be foldered to 

 the funnel at F, and likewife foldered at E. 



When water is poured into the funnel, and the cork K K in- Effect, 

 ferted into a bottle filled with gas, the water defcends through 

 the tube A till it arrives at the divifion or fe&ion B; it then 

 flows through the fmall holes at C, and afcends between the 

 tubes A and B ; flows over the top of D, and defcends again 

 between the tubes D and G, till it arrives at E (where it re- 

 gains the tube through an opening above E), and thence into 

 the bottle. As the water goes in, the air efcapes between the 

 tubes A and G, through the cock H, into the mouth-piece. 

 The lower end of G is made to perforate a cork which is pro- 

 perly attached to it, and which fecures it air-tight into the neck 

 of a common bottle, asfeen at fig. 3. 



The whole apparatus may be made for lefs than a guinea, It is very cheap, 

 and may be introduced to the bed-fide of the patient, if necef- 

 fary, by having a cafk filled inftead of a bottle, and placed 

 upon a chair. By turning the cock the patient may take an in- 

 fpiration whenever he pleafes, the cock being thruft into the 

 fpiggothole. 



I am, &c. 



N.N. 



SCIENTIFIC 



