120 REPORT—1868. 
Example of Analyzation according to the method of Mr. Scott Russell. 
Royal Mail Steamship ‘ Atrato.’ 
Length on load water-line, in feet .......... 0.02 cece eceees 3365 
fend themineteet mentee sides svclesthc «3 se ese Se he eee 40-92 
Mean draught of water without keel ............0.e0c0eees 18°35 
Area of immersed midship section, in square feet ............ 653 
Displacement in tons of 35 cubic feet. 72.4.0... 000: oe mee eee 3979 
Diameter of paddle-wheel outside floats, as taken from the draw- 
HAN ABUL ELT © ayes stoic aids a, oehemiasaec mu ateneue Gio ata ctageia esto eR 36°5 
Diameter of wheel to journals in feet or effective diameter...... 32 
ieiiicared Worse=power <{: . sl... «ak Pelee sie dvds le See 2207:98 
Spec pr stip in knots per hour :.2 2 £0. J)... 8.0.5. Se 11-22 
One knot being = 1°69 feet per second, hence speed of ship in 
Beeener SOCOM”. Gil Ceti sinie eem e os sts Saye ees Lee 18-96 
Consumption of coals, im Ibs. per hour-... 0. 5s2 025.2. vee 7936 
Coefficient of fineness of midship section or 653+Bxd=...... 0:869 
a AN body or 3979 x 35+BxdxL=...... 0-5512 
= Ay ends or D in cubic feet+>@xL= .... 0-6339 
os performance v° t= eh. WT. Bs 2th do ee 160-62 
s 1 WP oC Dae Wists <ghape ed ten eee 5005 
W in this formula means consumption of coals in ewt. per hour. 
Coefficient of performance vx = TEP i> aie ste ee 419-66 
Revolutions of paddle-wheel per minute .................... 14-42 
Velocity in paddle-wheel, in knots perhour ................ 14-29 
To find the velocity of the paddle-wheel, the effective diameter has been 
multiplied by 3:1416; this product has been multiplied by the number of 
revolutions per minute, this product again by 60, and the last product has 
been divided by 6082-66 to find as quotient the velocity in knots per hour, 
Slip in knots per hour equal to 14-29—11:22 ...... —— re 3°07 
Slip in feet per second equal to 3:07 x 1:69 ...... Ss. Fe ce 5:19 
ppera or ahip:. speed of Alip :: 1s teak «slew +o. 5 f.0e epeius aus ee 0-27 
Dip of paddle-board, measured from lower edge, in feet .......... 9 
Dene th of paddle-board,in feet. . 4°50. oid ps a's ow «dein § autho See 12 
Area of paddle-race 12 x 9 x 2, in square fect ....5...,..+.0e00- 216 
Area of midship section: Area of paddle-race::1: ..........4. 33 
Resistance due to area of paddle-race equal to speed of slip, in feet per 
second’, multiplied by the area of paddle-race, or 
5:19? x 216 = 5818 lbs. 
Resistance due to length of paddle-race equal to resistance due to area of 
paddle-race multiplied by the speed of the ship+speed of slip, or 
21,263 lbs. 
Coefficient of diminished resistance.—This coefficient belongs to a pure- 
mathematical wave-line bow. The question offers itself, what is the 
length of this bow ? 
The length of the bow of the ship can be denoted 
1. By the speed, 
2. By the place of half the beam in the light water-line, 
ee 
i 
