274 REPORT — 1859. 



ralty, at as early a day as may be convenient, for the furtherance of the 

 objects herein stated. On behalf of the Committee, 



(Signed) C. R. Moorsom, Vice-Admiral, 



February 17, 1859. Chairman. 



III. 



Statement handed in to the First Lord of the Admiralty by the Deputation, 

 particularizing the nature of the experiments which the Committee con- 

 sidered desirable should be made : — 



1. Experiments showing the resistance, by dynamometer, to being towed 

 through the water under the three following conditions : — 



The hull when launched. 



The hull with machinery on board. 



The hull when ready for sea. 



2. Experiments to determine the actual measure of stability under the above 

 conditions. 



3. Experiments showing the resistance when propelled by steam under similar 

 circumstances, both by indicator and dynamometer. 



These experiments to be accompanied by the following particulars : — 



1. The lines, dimensions, and ordinary elements of construction of the ship, 

 such as displacement, dimensions, and tonnage, area of midship section, 

 area at load water line, area of wet surface, &c, calculated measure of 

 stability, and other elements of form. 



2. Dimensions and number of boilers, grate surface, fire surface, tube surface, 

 . number, length, and diameter of tubes, and how disposed, number and 



dimensions of furnaces, &c, other elements of construction, regulation 

 pressure, working pressure, &c. 



3. Plan of engines, dimensions of cylinders, condenser, and air-pumps, de- 

 scription of valves, indicator diagrams, speed of piston, &c. 



4. Propeller — nature and dimensions, condition of draught and immersion 

 when working, measure of slip, propelling force by dynamometer, propel- 

 ling power by indicator, &c. 



IV. (See Tables 1 and 2 opposite.) 

 V. 

 Explanatory Statement to accompany the Returns relating to the Chester and 

 Holyhead Company's Steam-vessels. (See Report, p. 268, and Tables 1 to 

 15 inclusive, Appendix V.) 



For a full understanding of the Returns numbered 1 to 6, it is necessary 

 to give such explanation as may enable any one to compare the purpose they 

 were designed to serve with its fulfilment. 



The heading under which each Return is noted in the schedule in some 

 degree affords this explanation, but not altogether, and the following remarks 

 will supply the deficiency. 



When the four passenger vessels, ' Anglia,' ' Cambria,' ' Hibernia,' and 

 'Scotia' were first employed in August 1848, the commanders were author- 

 ized to drive them as hard as they could, subject only to the injunction not 

 to incur danger*. 



After some months' trial the qualities of each vessel and her engines were 

 ascertained, and a system was brought into operation which continues to the 

 present time. (Tables 3 to 15.) 



The Returns No. 2 and No. 6 show the results of the hard driving , and of 

 the commencement of the system periods. The column indicating " time," 

 "pressure," and "expansion," is the key to the columns "average time of 

 * See Evidence before Select Committee of House of Commons, 1850 and 1853. 



