474 



JNDEX TO VOLUME I. 



PERKINS. 



minimum consumption of fuel in, 

 163. 



Perkins, steam-guns, experiments 

 on, 35. 



Pernplet, coal distillation, coke 

 manufacture, utilization of bye 

 products, discussion of paper by, 

 99-101. 



Petit, expansion of air, 21. 



Physical forces, conservation of, 53 



. (convertibility of, 53 ; illustrations 

 of, viz., falling weight, 53 ; ham- 

 mer striking anvil, 53; fire syringe, 

 54). 



Plate-glass melting, application of 

 regenerative gas-furnace to, 89, 90. 



Pneumatic dispatch, circuit system, 

 Siemens's, 146 ; coal consumption 

 in, 147 ; speed of carriers in, 147 ; 

 vacuum in, 147 



Pneumatic despatch tubes, details 

 of, 153. See Steam-jet, Siemens's. 



Pole, W., Cornish engine, treatise 

 on, rei'erence to, 34 ; expansive 

 steam-engine, experiments on, 34. 



Power of heat-engine, formula for, 

 37. 



Preston, F., McCarter condenser for 

 steam-engines without air-pumps, 

 discussion of paper by, 167-168. 



Price's gas-producers, 175. 



Priming in boilers prevented, by in- 

 jecting hot air into water, 136. 



Producers. See Gas-producers. 



Puddling. See Kegenerative furnace, 

 Regenerative gas furnace. 



Pumping, 68 ; Cornish engine, eco- 

 nomy of, for high lifts in, 68 ; 

 crank and fly-wheel, employment 

 of, for low lifts in, 68. 



Pumping-engine, theoretical effect 

 of, 80. 



Punch, helical, 172. 



Punching, 171 ; experiments on, by 

 Kiley, J., 172 ; by Sharp, H., 172 ; 

 tension in metal produced by, 172. 



Pyrometer, copper or platinum ball 



REGENERATIVE CONDENSER. 



application of, 97 ; description of. 

 97 ; measuring high temperatures 

 by, 97. 



QUANTITY of heat, 18 ; in steam, 18. 



RAISING water. See Steam-jet, 

 Siemens's. 



Rankine, dynamical theory of heat, 

 32 ; fuel, evaporative power of, 

 126 ; steam, expansion of, 33 ; 

 steam-jet, investigations on, 144. 



Refrigerating machinery, 192 ; 

 power-producing machinery and, 

 essential difference between, 195 ; 

 Siemens's interchange!' of temper- 

 ature for, 193, 194, 201, cost of 

 ditto, 202 ; (Dr. Gorriv's < ~ 

 ton's, 193 ; action of, 194 ; concep- 

 tion of, error in, 194 ; description 

 of, 195 ; engine power, expenditure 

 of, examination of and report on, 

 195 ; expanding apparatus in, in- 

 quiry into cause operating against 

 performance of, 199 ; experiments 

 made with, 196 ; theory of, 197 ; 

 trial of, 193). 



Regenerative coke-ovens, 100 ; no 

 secondary products with, 101. 



Regenerative condenser, action of, 

 1, 3, 6 ; addition of, to injector 

 condenser, 5 ; applications of, 2, 8, 

 16 ; (for High-pressure engines, 4; 

 action of, 5 ; advantages of, 7 ; 

 applications of, 8, 16 ; description 

 of, 4 ; dimensions of, 8 ; indicator 

 diagram of, 6 ; saving of fuel with, 

 8 ; ) (Injection, 15 ; present form 

 of, 15 ;) for locomotives, 9, 16, 17 ; 

 (for Low-pressure engines, 11 ; 

 advantages of, 11 ; description of, 

 11 ); Society of Arts' Gold Medal 

 awarded to, 2 ; (Surface'. 13 ; 

 description of, 13, 15 ; essential 

 features of, 13, 15 ; rationale of, 

 13) ; water required for, 2, 6. 



