GAS-LIGHTING, REGENERATIVE SYSTEM OF. 



379 



mode in which this was done. A bunch of ordi- 

 nary flat flames are inclosed in a glass globe, 

 which is wholly closed except at the base, which 

 rests upon a column provided with passages for 

 admission of fresh air and the exit of the 

 products of combustion. These latter, rising 

 from the flame, encounter the obstruction of- 

 fered by the globe and are turned downward, 

 llowing the inner wall of the globe, as this 

 is the coolest path. They then pass downward 

 irough the annular space marked 3, 3, and 

 )y a flue out of the apartment. The enter- 

 ing fresh air passes upward through the an- 



FIG. 2. 



with which the passages are filled, to be given 

 out to the entering air and gas. 



In his earlier experiments Mr. Siemens sup- 

 posed that separate passages would have to be 

 provided for the products of combustion and 

 air in the globe, and the difficulty of accom- 

 plishing this was the chief reason of his aban- 

 doning the project. Later experience with re- 

 generative furnaces, as he says in his lecture, 

 showed him that this was not at all necessary, 

 as the paths naturally taken by tlie air and 

 products of combustion, due to their different 

 temperatures, were well marked. In Fig. 2 

 is shown a suspended lamp ; and in Fig. 3, one 

 arranged for a bracket. In this latter the air 

 enters at the lower side of the regenerator, and 

 the products of combustion pass out at the 

 upper. Mr. Siemens suggests that the regen- 

 erator be slowly rotated, so that the passages 



nular space marked 1, 1, to the flames, and 

 the gas through the central space 2. The 



FIG. 3. 



heated by the products of combustion will be 

 successively traversed by the entering air. An 

 increase of six times in the illuminating power 

 of the gas was claimed by Mr. Siemens for this 

 apparatus, but this must have been ft consid- 

 erably exaggerated estimate, as it appears to 

 have been entirely abandoned in favor of a 

 burner of different construction, the best yield 

 of which does not reach more than half that 

 result. 



This latter burner is shown in Figs. 4 and 5. 

 It consists essentially of a central annular cham- 

 ber, B (Fig. 4), down through which the prod- 

 ucts of combustion pass to an escape-flue, G. 

 The gas issues from the upper ends of a ring of 

 small copper tubes, one fifth of an inch in di- 

 ameter, surrounding this central chamber. The 

 air to support the combustion enters through 

 the annular space 0, between the central cham- 

 ber and an exterior casing. The central regen- 

 erative chamber, as well as the annular air- 



heat of the escaping products of combustion space, is packed with a filling presenting an 

 is stored up in the metal surfaces of the extended surface to the hot gases and entering 

 burner, and the gauze or perforated metal air, so that there is a very pertect interchange 



