JM)EX TO VOLLM1: I. 



OA8-PBODUCEB8. 



ital cooling tube in, 89 ; pro- 

 i'i<.ii of sulphuring due to 

 chemical transformation in, 92 ; 

 (Sievunu'g, C. W., new form of, 

 inscription of, 183 ; high temper- 

 ature in centre of mass of, 183 ; 

 modus opernndi, 1 83 ; water de- 

 composed to enrich gases from, 

 183) ; successful use of, 86 ; under- 

 ground use of, suggested, 95 ; uni- 

 form quality of gas from, 88 ; 

 water decomposed in, 87. 



Gas-producers, 175; concentrating 

 heat in, 175 ; historical record of, 

 175 ; Liirmann's, 175 ; Price's 

 -imilarto Siemens's old form, of, 

 175 ; retort action too slow for, 

 177 ; Siemens's, C. W., patents of 

 1863 and 1864 for, 176 ; Siemens's, 

 86, 182, 183. 



Gas-retorts, method of producing 

 .separate heating and illuminating 

 gas in, 185, 186 ; M. Ellissen's and 

 M. Regnault's experiments on, 

 185 ; variation of quality and 

 quantity of gas from at different 

 periods of operation, 185, 186. 



Gasworks, regenerative gas furnace 

 applied at, 94. 



Gaseous fuel, 177, 184 ; advantages 

 of, 178, 179 ; arrangement to pro- 

 ducefrom retorts with illuminating 

 gas, 185 ; for distant supply, 184 ; 

 heating power of, 178 ; prevention 

 of smoke by use of, 179 ; producers 

 for, 86, 182 ; reason of heat-energy 

 of, 178 ; retorts for, 181 ; Siemens's 

 new producer for, 183 ; Siemens's 

 producer for, 86, 182. 



Gay Lussac, expansion of air, 21. 



Gay Lussac and Clement, steam, 

 quantity of heat in, 19. 



Giffard injector, 78, 101 ; action of, 

 102, 103 ; action of, how paralyzed, 

 103 ; advantageously used when 

 water has to be heated and raised, 

 106 ; (application as 



GOVERNOR. 



79 ; economy in, reason for want 

 of, 80 ; inferior to a pump in, 80) ; 

 boiler feeding, economical for, 80 ; 

 comparison of theory and practice 

 in, 79, 104, 105 ; entire condensa- 

 tion of steam jet necessary in, 

 103 ; failure, cause of partial, 105 ; 

 jets of water and steam, relative 

 areas of, 104 ; marine engines, 

 applicability to, 104 ; motor, in- 

 applicability of, as, 104, 106 ; 

 quantity of water which may be 

 forced into boiler by, 103 ; refer- 

 ence to, 143 ; and steam jet, 

 difference of action between, 144 ; 

 theoretical considerations regard- 

 ing, 102; water, increased tem- 

 perature of, passing through, 78, 

 103, with higher pressure of steam 

 in, 79. 



Glass-melting in regenerative gas 

 furnace, 89, 90, 91. 



Gorrie, Dr. See Refrigerating ma- 

 chinery. 



Governor (Chronometric, 108; ap- 

 plication to astronomical and 

 chronographical instruments, 109 ; 

 cross-armed, good action of, 1 40 ; 

 instantaneous and regular action of, 

 109, 110; leading idea in and how 

 realized, 109 ; uniform rotation 

 obtained by, 109) ; Foucault's, 110; 

 (Gyrometric, description of, 120, 



121 ; formula for speed of cup of, 



122 ; rapidity of readjustment of, 



123 ; uniform velocity of engine 

 governed by, 123) ; ( Watt's cen- 

 trifugal, 107 ; action of, 107 ; 

 defect of, 108 ; depends on per- 

 manent change of speed, 108 ; 

 improved suspension of, 108 ; 

 throttle valve, how worked by, 

 108). 



Governor for steam engine, 139 ; 

 advantage of addition of spiral 

 spring to, 140 ; chronometric ac- 

 tion of, 139. &c Alleo. 



