BAIRD &.TATLOCK (LONDON) LTD. 



5612 

 Simmance & Abady's Patent Recording Calorimeter (Calor-graph). 



This instrument (Fig. 5612) automatically records on a chart the calorific power of any gas in heat units. 

 The gas passes through a pressure governor and then through a governor which is actuated by changes in specific 

 gravity. It therefore maintains a gas flame consuming the same volume of gas per hour whatever the change in 

 composition. The heat of combustion of this constant flame varies according to the calorific power and operates 

 a recording thermometer (differential), the pen of which marks on a chart graduating in B.T.U., per cubic foot or 

 calories per cubic metre, said chart being made to revolve by clockwork. The Differential Thermometer is com- 

 posed of opposing diaphragms lined throughout with a plating of palladium hermetrically sealed and containing 

 air under pressure. They are made differential so as to set up an automatic correction for changes in atmospheric 

 temperature and pressure. The Calorimeter thus possesses the following advantages. 



(a) It is made in ranges suitable for any gas. 



(6) It requires no water nor dees it utilise any uncertain expansion of metal or other principles which 

 involve empirical adjustment. Its results are automatically reduced to N.T.P. 



(c) No meter, pendulum or other devices used ; there are no water levels to adjust. It is absolutely 



simple, small in bulk, and it can be set up and started just as it is taken out of the packing case. 



(d) It has practically no moving parts, nothing to get out of order and is incorrodible. 



5612* Simmance & Abady Patent Calor-graph, 80 to 300 B.Th.U.'s . . 



5613 T Simmance & Abady Patent Calor-graph, 380 600 



5614 r Simmance & Abady Patent Calor-graph, 450 700 



5615 1 Simmance & Abady Patent Calor-graph, 02500 cals. per cubic metre 



5616 T Simmance & Abady Patent Calor-graph, 2500 5500 





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CROSS STREET HATTOTST GARDETST, E- C 



