386 



EXPLANATION OF THE PLATES. 



DIAGRAM, No. 3. 



15-97 - 2 = 13-97 ; 13 ' 97X28 ~ 7X228 = 272-8 Horses' Power. 



33,000 



!? 

 ^ 



S i 



g 



re o 



-. 5 



X 



1--7 



7-3 17-3 ir-3 



Pressure of Steam in Boilers, 10 inches of Mercury. Taken in the Humber; strong 

 head wind and ebb tide. Revolutions, 19. Condenser Gauge, 29'3. lOh. 30m. A.M. 

 From London to Hull. April 8th, 1838. 



DIAGRAM, No. 4. 



i A A i a 1 o .1 1 12-41 X 2827 X 261 _ . , n 

 14'41 2z= 12'41 ; . =277'4 Horses Power. 



33,000 



Pressure of Steam in Boilers, 12 inches of Mercury. Revolutions, 21 '75. Con- 

 denser Gauge, 29-5. lOh. 30m. A.M. Taken in the River Thames. 

 From Hull to London. April 12th, 1838. 



