58 THE FIRST SEA LORD OF THE ADMIRALTY. 



decidedly the most efficient fixed foul-air withdrawing 

 medium that I ever met with." 



Mr. Ernest Turner, F.R.I.B.A., author of several well- 

 known sanitary works, writes : " Boyle's Patent Self- 

 Acting Air-Pump Ventilator is the best soil-pipe ventilator 

 that I know of." 



For the ventilation of ships the Air-Pump Ventilator is 

 invaluable, for it never requires trimming, and is always in 

 action under every condition and variation of weather. 

 Being perfectly watertight it does not require to be 

 removed during rough weather, as is the case with other 

 ship ventilators. It is now extensively used by all the 

 leading steamship companies in Europe, and in the British 

 and foreign navies. 



Admiral Sir Hastings Reginald Yelverton, G.C.B., First 

 Sea Lord of the Admiralty, says respecting it : " I have 

 great pleasure in recommending Mr. Boyle as sole inventor 

 of a ventilator which I found of the greatest use during 

 my three years' command in the Mediterranean, on board 

 Her Majesty's Ship Lord Warden" 



The ventilation of ships is a question of the deepest 

 concern. It is a question affecting the health and lives 

 of thousands of brave mariners, and also touches directly 

 the food and fuel supply. The shippers of cattle must 

 suffer to a large extent through the cattle being lessened 



