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