BAIRD &TATLOCK (LONDON) LTD. 



4845 



4 & Box Photometer, after Lummer Brodhun, for hand use. The rays of light falling on 

 two dials non -transparent, are reflected on to prism in such a way th^t the image of 

 one of the sides of the dial appears enclosed in the image of the other dial, and thus renders 

 the comparison of the intensity of the light easy. The two discs are reversible 



116 s Box Photometer, after Lummer Brodhun, as above but larger pattern 



550 

 7 17 6 



4847 



417 1 Simmance-Abady Patent Combustion Recorder 



1 The instrument automatically analyses boiler flue gas, and records the percentage upon a chart. 

 1 momy in boiler firing is dependent upon the percentage of CO, (carbon dioxide) in the flue gases, and coal which 

 s uld produce 15 per cent, of CO., is frequently so fed with air as to only produce 5 per cent. The loss through 



p low percentage of CO, is something like a quarter of the fuel bill. These recorders are therefore used to 



dble the stoker to so operate his firing so as to get a high percentage of CO a , and also to enable the proprietor 



d(i works to see that the coal has not been wasted. The instrument is simple, entirely automatic, and inex- 



sive, and is made in England. It is also made in combination with a draught recorder, and full particulars 



1 be furnished on application. Application should state number and type of boilers, when full details will 

 q:orwarded. This is a practical instrument, and many hundreds are in use all over the world. They undoubtedly 

 e boiler fuel. 



25 



(CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



883 



