

526 report— 1879. 



in working cost must of course be first considered, and in the adoption of all such 

 means of promoting economy as have been referred to it may be confidently as- 

 serted that the saving in working cost which will be effected by the economy of 

 fuel resulting from the adoption of such appliances as have been mentioned, will 

 as a rule wipe off the extra first cost incurred by such appliances in a very short 

 period, since the saving effected will probably vary from 50 to 150 per cent, per 

 annum on the first cost. 



4. On the Law of the power required for different speeds of the same steam 

 vessel, illustrated, within the limits of experience, by a linear scale of 

 their relation. By Robert Mansel. 



