116 REPORT—1868. 
Table A.—Particulars of the trial trips of four Holyhead Mail Steamers 
‘ Banshee,’ ‘ Llewellyn,’ ‘ Leinster,’ and ‘Connaught,’ in comparison with 
H.M.S. paddle-yacht ‘ Victoria and Albert.’ 
This Table does not mention the displacement of the ships. Where it has been 
possible these quantities have been filled up from the lines and from other sources 
of information. 
Report 1863 contains two Plates showing indicator-diagrams of H.M.S. 
‘Victor Emmanuel’ (fore-cylinder and aft-cylinder), 
The pressure of steam in the cylinders, and the indicated horse-power as cal- 
culated by these diagrams, are given in Table IX. of this Report. 
Of the five Royal (West-India) Mail Packet Company’s Steamships 
whose performances were published in Tables III., [V., and V., Report 1863, 
the performances of two have been condensed and inserted in this Report, 
viz. the ‘ Atrato’ (paddle), built by Messrs. Laird and Co., and the ‘ Tas- 
manian’ (screw), by Messrs. Laurence Hill and Co. 
The nominal horse-power of the screw-steamer ‘Tasmanian’ is given as 
744 in Report of 1863, and 550 in earlier printed Tables. In earlier Tables 
the nominal power of the ‘ Atrato’ is given as 800, whereas in the Report of 
1863 it has been published as 766. Further, it appears that the indicated 
horse-power, as given in the condensed Report of 1867, is the I. H. P. as 
measured in one cylinder only, in the case of the paddle-steamers ‘ Atrato,’ 
‘Shannon,’ and ‘ La Plata.’ 
Condensed Tables. 
Performance of two Royal (West-India) Mail-Packet Company’s Steamships 
on a voyage of 3622 miles. 
Named Atrato, Tasmanian, 
SSP ED DOE SCUCSEO “ICSE RERERSARECE RR SCOR paddle. RL; 
Length on load water-line, in feet ............ 336°5 332° 
Breadth (extreme), in feeb -.:,.....--cence-r ors 40°92 39° 
Mean draft of water, in feet ............,...+- 18°35 19°g 
Area of immersed midship section, in sq. ft. 653° 666° 
Displacement, in tons of 35 cubic feet ...... 3979° 3760" 
Mean immersed girth, in feet ................6+ 52°54 52°52 
ENGINES 
IBGRCHID MON! cvaackosssttaetemesee Make. aaaese es Side lever. Tr. inverted. 
Number ofcylinders’ 'i-s.¢-4-c0-dets sence 2 3 
Diameter of cylinders, in inches............... 96" 68° 
Length of stroke; in-feet):s..es. 0% ssescsaneess es 9 3°5 
Number of revolutions, per minute ......... 14°42 41°76 
Average steam as per card, in lbs. ............ 6°54.7 5137, 
Average vacuum as per card .............0246- 11181 9°712 
Pressure of steam as per gauge, in lbs. ...... 13°41 I5'I 
Vacuum as per gauge, in inches............... 26° 25°95 
Nominal hhorse=power? .....025-secssctsnensecses- 800° 550° 
Indicated horse-power from one cylinder ... 2207'°98 1442°19 
Coals consumed, in lbs. per hour ............. 7936 6896" 
Speed of ship, in knots per hour............... 1122 10°67 
From “ Particulars of Trial Trips, Table A,” Report 1863, in which the 
performance is given of the four vessels on the Mail Service between Dublin 
and Holyhead with a voyage on the same route of the ‘ Victoria and Albert,’ 
