490 
EXPLANATION OF THE PLATES. 
Depth of centre of gravity of displacement below the load water line, 5 
feet 25 inches. 
UNDER WHAT CIRCUMSTANCES. 
Number of 
strokes per 
minute. 
Velocity of 
vessel. 
Velocity of 
wheels. 
Multiple 
of the speed 
of vessel equal 
that of the 
wheel. 
In a moderate breeze, going free, with half the sails set .... 
Number. 
22 
Miles per hour 
12 
Miles per hour 
18 
1-5 
Moderate breeze, wind ahead 
18 
9-75 
14-7 
1-5 
Ditto, head sea 
16 
8-25 
1-6 
1-66 
Strong breeze, wind ahead, and head sea 
12 
5’5 
918 
In a fresh gale ahead, and a heavy head sea 
9 
4-25 
7-3 
1-71 
Feet. Inches. 
Diameter of cylinder 5 0 
Length of stroke 5 2 
Diameter of air pump 3 0 
Length of stroke ... ....... 3 0 
Diameter of paddle wheel 22 0 
Breadth of ditto 9 7 
Average consumption of coals, 18 cwt. per hour. 
It would be impossible to deduce any rule to shew the exact relation between 
the velocity of the vessel and that of the wheel, for the want of some instrument 
that would mark accurately the speed of the vessel, With this multiple, however, 
we may determine nearly the relative perfection of different steam vessels, when 
the surface and position of other floats are in the same relation to each other; and 
by a proper register of these numbers, the relative perfection of paddles on the 
same vessel may be determined by bringing her under the same circumstance as to 
draught of water, &c. 
SCANTLINGS, ETC. 
No. 
| Feet. 
Inches. 
1 
o 
£ 
Feet. | 
Inches. 
Keei,. Elm. Moulded 
1 3 
5 0 
1 2 
8 
0 1 
0 10| 
0 4 
(Aft 
o 10Î 
1 3 
Below the rabbet 
0 11 
1 2A