Transactions' Society Naval Architects and Marine Engineers, Vol. 22, 1^14. 



Plate 21. 



To illustrate paper on "The Thermodynamics of the Marine Oil Engine," 

 by John F. Wentworth, Esq., Visitor. 



THE INTERNAL COMBUSTION ENGINE AS A RECORDING THERnonET^R 



NOTE: 



GOOD RESULTS CAN BE OBTAINED FROn M ^<rTU^L 

 CKRO BY ENLARGING THE QARO AS SHOVJH BV ?\Q,.Z. 0F\ 

 BY SCALmOr PRESSURE, CALCULATmGi THE TEnPEHKTURE , 

 PLOTTING THE RESULTING FIGURES AND DRKVJtNG A SMOOTH 

 CURVE THROUGH THESE POVNTS. BY HEANS OF THE NE\N 

 TtnPERATURE P0\NT3 PRESSURES QAN BE 0ETERn\NEO 

 BEYOND THE AC<:URK<iY OF THE iNOVQKTO^. 

 FORnULK FN/ = RT 



P- ABS. PRESS. PER j. R- CIONSTANT, 53.12. FORA\R- 



V = qU.FT TO \ LB. OF MR T- ABS. TEnf- GLASS READ.+'^fcO.I F 



\N TH\S WORK THE TEHR AT P>E&lMNiN& Of COMPRESSION HAS BtEN 

 ASSuntD. TH\S F\6URE \o.\/ERY VJNCEKTWU. FOR E:XA<;T 

 EXPERVnEHTS \T \S SUSaESTED THKT THE TEHPERKTURE OF 

 THE EXHAUST BE OETERniNED BY PYROnETEFl AMD RESULTS 

 FV&URED QA-^-KV^ARO FHOn THE EXHAU3T. 



THE ERROR \HTH\2. \NILL HOT WKH«£ TV\E SHAPE OF THE 

 TEtAPERAT URE CURV ES 0\\( EN. 



PER CENT 



40f. 50% 60% 70% 60% 90% 



COMPRESSION OR E><.PAMSVON IM TERMS OF ORIOVNO.U VOLUME. 



10 ar- 





