Jcoujks.— Marquis of Wofcejer'j Sieam-Engwe. 41U 



the ftreef, In London, when I perceived the window to be agitated with certain tremulous 

 motions, attended with a confiderable found. The reiterations were fliort and diftinft, three 

 or four at a time; and then ceafed till a fecond and a tliird repetition of the fame effedt 

 took place. This remarkable procefs continued to increafe in intenfity of found, and en- 

 gaged my attention for about a quarter of an hour; after which the nearer approach of one 

 of thofe inftruments called a tambourin, compofed of parchment (Iretched on a hoop, and 

 played upon by rubbing the extremity of the finger upon its furface, evinced that the agita- 

 tion and found emitted by the window had been caufed by the vibrations of that inftrument. 

 Hence it fliould appear, that the judicious conftruftion of an inftrument for receiving and 

 magnifying founds would not only require a fcientific arrangement of an external part 

 to exclude foreign founds, and reflcding furfaces to modify and augment the direft undula- 

 tions ; but that the laft effea fliould be received on a tympanum capable of adjuftment in its 

 tenCon, and thence conveyed by a proper veftibule to the organ of perception itfelf. If the 

 fcience of receiving and augmenting founds were once improved to the degree here Iketched 

 out, there would probably be no difficulty in magnifying founds intended to be conveyed 

 from one place to another. 



VI. 



Concermtig the Steam-Eiiginc as ongiimlly invented by the Marquis of IFoRCESTER, and the 

 Improvements fmce made in Steam-Engines -without the Pi/Ion or Lever. IFith a Defcription 

 of an Engine of this Kind confiruBed by Mr. P£T£R KjER, of Kentijh Town. 



T 



J. HE Marquis of Worcefter Is the undoubted inventor of the (team-engine, which i'} 

 defcribed in his Century of Inventions. From the title, he appears to have conftruaed 

 one before the year 1655. His words. No. 68, are as follow : 



«' An admirable and moft forcible way to drive up water by fire, not by drawing or fuck- 

 ing it upwards ; for that muft be, as the philofopher calleth it, intra fpha:ram aaivitatis, 

 which is but at fuch a diftance. But this way hath no bounder, if the vefTels be ftrong 

 enough ; for I have taken a piece of a whole cannon whereof the end was burfl, and filled 

 it three quarters full of water, ftopping and fcrcwing up the b.oken end, as alfo'the touch- 

 hole i and making a conftant fire under it, within 24 hours it burft and made a great crack • 

 fo that, having a way to make my velFels fo that they are ftrengthened by the force within 

 them, and the one to fill after the other, 1 have feen the water run like a conftant foun 

 tain ftream forty foot high. One veflll of water rarefied by fire driveth up forty of cold 

 water. And a man that tends the work is but to turn two cocks, that, one velTel of water 

 being confumed, another begins to force and re-fill with cold water, and fo fuccelfively the 

 fire being tended and kept conftant ; which the felf-fame pcrfon may likcwifcly abunda'ntly 

 perform in the interim between the ntceffity of turning the f.iid cocks." 



Piatt XVII. rig. 1, reprefents the fteam-enginc whicli was made by Captain Savery and 

 generally fuppofcd to be the fame as the Marquis of Worccftcr's. A reprefents a boiler 

 containing water, the fteam of which may be tranfmited into either of the veflcls B and C 

 by means of the cocks D £. The veffcls have a comnm.iicatlon at bottom with the vcr- 



3 ii * tical 



