68 



APPENDIX. 



In examining this table, it will be seen that vessels with similar wheels, whose tonnage is 

 large in proportion to the horse power, in every case consume less fuel per ton during the 

 voyage : for instance, in the Hermes, which has the largest proportional tonnage, viz. 5'21, 

 the consumption per ton is 1544 Ibs. ; being less than half that of the Alban, viz. 3722, the 

 tonnage of which is the least (viz. 2'94) per horse power. 



In the vessels with Morgan's wheels the largest proportional tonnage is the Flamer, being 

 4 1 13 per horse power ; the consumption per ton is 1477. In the Columbia, the tonnage per 

 horse power is 3'60, and the consumption per ton 1833. 



The most direct comparison in the table is between the Hermes and the Messenger, being 

 vessels of equal tonnage and similar wheels, but with different power, the former being 140, 

 and the latter 220 horse. The consumption of the Hermes is not more than frds that of the 

 Messenger. 



As an additional confirmation of these results, I have given the following table of the mean 

 time of performing several voyages, between Liverpool and Kingstown, of Her Majesty's Post 

 Office packets, Comet, Etna, Thetis, and Dolphin, between January and June, 1837 ; with 

 the quantity of coals consumed, and the same calculated columns as in the preceding table. 



TABLE X. Performances of Her Majesty's Post Office Packets 

 between Liverpool and Kingstown. 



These results, it will be seen, confirm those of the Mediterranean packets ; the con- 

 sumption being less per ton during the voyage, when the tonnage of the vessel is largest in 

 proportion to the horse power. 



We may therefore fairly conclude, that the idea of a saving of fuel being effected by 

 increasing the power of a vessel is erroneous. Under particular circumstances it may happen, 

 that an additional power may effect a saving ; but, generally speaking, it may be assumed, 

 that a great economy of fuel will be obtained by diminishing the power of the vessel as much 

 as possible, provided there is sufficient at command for the safety and management of the 

 vessel, should circumstances require it. 



