48 INVITED BY THE ROYAL SOCIETY. 



the success of the Air-Pump Ventilator that it should have- 

 received the approval of the Society, and that almost its- 

 first application should be to the Institution founded by 

 an illustrious namesake, Robert Boyle, Earl of Burlington.* 



There have since appeared numerous exhaust ventilators 

 which act on the same principle, but they are all more or 

 less appropriations of Robert Boyle's original invention,, 

 cunningly varied in detail to avoid infringement of patent 

 rights. Continued experiments extending over many years 

 have brought the construction of the ventilator so very 

 near perfection that these imitations in every instance- 

 appear to lose in efficiency proportionately as they deviate 

 from the form of the original. 



The leading principle in the Air-Pump Ventilator is the 

 utilization of a great and ever varying natural force th& 

 motion of the atmosphere to extract foul air from the- 

 interior of buildings. Nature has provided a proper venti- 

 lation for the surface of the earth in the restless current of 



the air. 



" The circling typhoon whirled from point to point 

 Exhausting all the rage of all the sky," 



* " Why need I name Boyle, whose search amid the dark recesses 

 of his works the greater Creator sought ?" James Thomson. 

 " Who shall grace, or who improve like Boyle ?" Pope. 

 " Recommend the good we owe a Boyle." Sir Samuel Garth* 

 " Thy Boyle in wisdom found content." Lord Lyttleton. 



