50 Horses on Board Ship. 



the progress of the ship, when she is at full 

 speed. In any case, the working of the fans 

 will entail an increased expenditure of coal, 

 especially when they are kept at full speed, 

 and consequently this method of ventilation 

 is not usually regarded with favour by 

 masters and chief engineers who are forced 

 by their employers to practise rigid economy. 

 Dr. Edmond's system of obtaining an out- 

 let for ventilation by means of a " steam 

 jetter" placed inside a cowl ventilator, acts 

 well. When there is a strong breeze, the 

 steam can be shut off, and the cowl of the 

 ventilator trimmed to the wind, in which case 

 the ventilator will form an efficient inlet. 

 The steam in the boiler should be kept at 

 a pressure of at least 4olbs, 



