Notice and description of a Marine f entilator. 



77 



By the use of this machine, vessels may be ventilated at sea, at 

 any time, in any situation, and in any weather, and a current of pure 

 air be made to pervade the interior of the vessel, v^hile her hatches 

 are kept closed ; whereas in the ordinary method, it is only in situa- 

 tions when the hatches can be open, and the vessel at anchor, or in 

 smooth water that any thing of the kind is attempted, and even then 

 with comparatively, but partial effect. 



Considering the very great importance to commerce and navigation, 

 attached to the preservation of vessels and cargoes, which, especially 

 in long voyages, and warm seasons and climates, depends in so great 

 a measure upon the purity of the vessel's hold ; and also the very 

 imperfect manner in which that object has heretofore been ordinarily 

 attained ; it is presumed that essential benefit may be derived from 

 this improvement to the community, in those branches of its interest. 

 Redding, Conn. Dec. 29th, 1829. 



G 



F 



H 



A 



E 



^^ 



a 



F 





IS''"---... 



E 



A, A, A, A, The four compartments. 



B, B, The midriff. 



C, C, Two apertures in upper compartments ; valves inside. 



D, D, Two apertures in lower compartments ; valves outside, 



E, E, Perpendicular partition. 



F, F, Pistons, or pitmans. 



G, G, Break, or lever. 

 H, Fulcrum. 



Dotted lines exhibit the sweep of the midriff. 



Remarks. — The object of the above invention is important ; and as 

 far as we can judge without having seen a working model ; and with 



