ON STEAM-SHIP PERFORMANCE. 



285 



hours. 6.744. 7- Paddles, 3303 in 2-305 hours. 8. 12-65 knots, or 14-55 

 miles. 9. 11-15 knots, or 12-82 miles. 10. 11-9 knots, or 13-69 miles. 

 11. 210 by 32. 12. 214, square Ft. 13. 7 ft. 6 in., both. 14. 820 tons. 

 21. Diameter to Journals, 20 ft. 6 in.; 11 floats, 7 ft. long, 3 ft. broad and 

 f thick. 22. Feathering. 26. Double Cylinder. 27- Large, 4 ft. 3 in. 

 stroke, 76h in. diameter; Small, 4- ft. 3 in. stroke, 48^ in. diameter. 28. 

 Steam-jacketed. 29. Four. 33. Engine and Boilers, 210 tons. 34. 24 re- 

 volutions. 38. 744. 39. Average, boiler 25 lbs., cylinder 19 lbs. 44. See 

 column 33. 47. Grate, about 100. 56. 2206 lbs.— Certified by W. J. 

 Macquorn Rankine. 



Return of Particulars respecting the Steam-ship 'Emerald ' whilst under Trial. 



1. Ayr Bay, July 21, 1859. 2. Still water, light airs. 3. 30 cwt. 4. 

 13| cwt. 5. Not known. 7. 80 per minute. 8. 12 miles. 9. No tide. 

 10. 12 statute or 10f 5 T knots. 13. 10 ft. forward and same aft. 14. 150. 

 16. Diameter, 9 ft.; 3-blade; pitch, 14 ft.; area of blade, 20 ft. 17. 18 in. 

 18. 33 cwt. 19. Not known. 20. Not known. 26. Horizontal. 27- Length 

 of stroke, 22 in. ; diameter, 28 in. 28. No. 29. Two. 30. Common 

 condenser, contents not known. 31. Trunk, 3476 cubic inches. 32. Com- 



mon slide valve. Area not known. 



degrees. 36. 56 ft. 37- Eighty. 



Vacuum in condenser, 23* in. 41 



length, 9* ft.; breadth, 13|. 34. 



Four. 47. 1313 ft. 48. 198 ft 



50. At front, 26 in.; at back, 19 in.; mean, 22|. 51. 17fJ- 



tubular. 53. 270 iron tubes, 6^ ft. long ; exterior diameter, 3| 



54. One, 26 ft. by 4 ft. diameter. 55. 13* lbs. 56. 13| cwt 



33. Not known. 34. 293^. 35. 95 



38. Not known. 39. Not known. 40. 



One. 42. Tubular. 43. Depth, lift.; 



Not ascertained. 45. Not known. 46. 



49. At door, 19 in.; at back, 26 in. 



52. Boiler 



interior, 2-£. 



Continuation of Table 1, Appendix VII. For Mean Speed. 



