OBSERVATIONS made on the Performance of the Engines of the Steam Ship Wilberforce, from Hull to London, 
11th and 12th of April, 1838. 
Time. 
Pressure of 
steam in 
lbs. per 
quareinch. 
h. 
m. 
11 
25 
4-5 
12 
30 
4-5 
1 
0 
4-5 
1 
30 
4 5 
2 
30 
40 
3 
15 
4-5 
3 
30 
4-0 
4 
20 
4-5 
4 
30 
475 
5 
30 
510 
G 
30 
5-25 
7 
0 
5-0 
7 
30 
4-5 
8 
0 
.... 
8 
20 
8 
30 
4-25 
8 
55 
4-5 
9 
25 
4-5 
9 
30 
5-75 
9 
50 
5-5 
10 
30 
5-0 
11 
30 
4-5 
11 
55 
.... 
12 
30 
4-5 
1 
0 
4 
15 
575 
5 
30 
4-5 
7 
0 
50 
7 
32 
5-5 
9 
25 
5-5 
10 
30 
GO 
11 
35 
55 
Number. 
135-85 
28 
of 
engines. 
2075 
21-5 
21 -G 
210 
21 
20-5 
21 
20-5 
20 
20 
20- 5 
21 
21- 25 
21 5 
21-5 
21.75 
Condenser 
gauges. 
29-5 
29-5 
29-5 
29-5 
29-5 
29-5 
29-5 
29-5 
29-5 
29-3 
29-3 
29-3 
29-5 
29-5 
29-5 
29-5 
290 
29-0 
29-2 
29-4 
29-4 
29-0 
29 4 
29-3 
290 
29-0 
29-0 
290 
Temperature 
of 
water. 
Temperature 
of water 
from 
condensers. 
Temperature 
of water 
from air 
pumps. 
Temperature 
of water 
from casing 
round chimney. 
44° Humber. 
G0° 
61° 
—* ! 
0 . 
45° Nore. 
58° 
55° 
74° 
1 
Temperature 
of 
atmosphere. 
59° 
Ft. Ft. In. 
Started from abreast the Hull Docks, draught forward 10; aft 11 2. 
Wind WSW.; gib and fore sail set. 
Abreast of Spurn Lighthouse. 
Gib, top, and fore sails set (swell). 
Commenced weighing coal, but obliged to discontinue on account of 
the swell. 
Observations. 
G0° 
Abreast of the Dudgeon. 
Abreast of Hasborough Lights. 
Wind WSW., abreast of Winterton, all sails set. 
Abreast of Newharp ; fresh head wind, all sail off. 
Abreast of Yarmouth. 
Abreast of Lowestoff. 
Abreast of Orfordness. 
Abreast of Harwich ; engines obl’ged to be stopped owing to the 
brasses of one of the starboard great levers heating through neg. 
lect, the vessel floating back with the ebb tide to nearly abreast 
of Orfordness, when the engines were again started. 
Again abreast of Harwich. 
Abreast of the Nore Light vessel. 
Abreast of Gravesend Pier. 
Took Diagram No. 4. 
Abreast of St. Katherine’s Wharf. 
4-85..Mean pressure of the steam in lbs. per square inch. 
20-75.. Mean revolutions of the engines. 
249. .Velocity of the pistons in feet per minute. 
Total time occupied from Hull to London 
Time lost by stopping engines off Harwich 
Time occupied from Gravesend to London including ) 
many interruptions arising from a crowded pool $ 
Total time occupied from Hull to Gravesend 
hrs. min. 
24 10 
3 15 
1» 45 
It 
H 
ms, 
-A. 
.VV7': 
7- 
EXPLANATION OF THE PLATES. 389