44 Horses on Board Ship. 



Air-scoops are almost always used with 

 port-holes and scuttles, in which case they 

 are made of sheet iron, are about 20 inches 

 long, and look like a tube cut longitudinally 

 in two, blocked in at one end and fur- 

 nished at the other end with a rim which 

 fits into the port-hole. Openings in the 

 side (generally on the main deck or on the 

 spar deck, according to the type of ship) 

 may be provided with air-scoops, either by 

 means of the door of the opening (Fig. 3) 

 or by boards. Air - scoops being inlets 

 should of course be kept trimmed towards 

 the wind. In Fig. 18, p. 121, an air-scoop 

 may be seen out of use, below the scuttle 

 (small port-hole). 



The usual form of a cowl ventilator is 

 that of a vertical iron tube provided with a 



