SIR CHARLES W. SIEMENS. 71 



ex-Chief Commissioner of Works, who, with the inventor, 

 carried out a series of experiments, extending over several 

 months, with the view of making the apparatus as perfect 

 as possible. The late Sir Charles W. Siemens, the eminent 

 electrician and inventor, took considerable interest in this 

 invention, and after practical tests expressed his high 

 approval of it, specially commending its extreme simplicity. 

 There is really no limit to the value of this apparatus. We 

 not only need pure air, but we also want to regulate its 

 temperature, and Mr. Boyle may certainly be congratulated 

 upon having met these wants in such a simple and yet effec- 

 tive manner. 



The pestiferous state of the atmosphere in public build- 

 ings and private rooms, after the gas has been lighted for 

 some time, is known to be an evil more dangerous and 

 disastrous to health than the consumption of unwholesome 

 food, but very little seems to have been done towards 

 remedying it until Mr. Boyle conceived the idea of conveying 

 the products of combustion directly away from the gas 

 without permitting them to mix, or come into contact, with 

 the air of the room. This was accomplished by the use of 

 concentric tubes, which, while clearing the atmosphere of 

 the products of combustion, also prevented the radiation of 

 heat, keeping the room cool and agreeable, however numerous 

 might be the lights. Considerable notice was taken of this 



