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 thick. 22. Feathering. 26. Double Cylinder. 27. Large, 4 ft. 3 in. stroke, 76 in. diameter; Small, 4 ft. 3 in. stroke, 48 in. diameter. 28. Steam-jacketed. 29. Four. 33. Engine and Boilers, 210 tons. 34. 24 revolutions. 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.

4.

1. Ayr Bay, July 21, 1859. 2. Still water, light airs. 3. 30 cwt. 13 cwt. 5. Not known. 7. 80 per minute. 8. 12 miles. 9. No tide. 10. 12 statute or 10 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. Common slide valve. Area not known. 33. Not known. 34. 293. 35. 95 degrees. 36. 56 ft. 37. Eighty. 38. Not known. 39. Not known. 40. Vacuum in condenser, 23 in. 41. One. 42. Tubular. 43. Depth, 11 ft.; length, 9 ft.; breadth, 134. 34. Not ascertained. 45. Not known. 46. Four. 47. 1313 ft. 48. 198 ft. 49. At door, 19 in.; at back, 26 in. 50. At front, 26 in.; at back, 19 in.; mean, 221. 51. 17 52. Boiler tubular. 53. 270 iron tubes, 63 ft. long; exterior diameter, 3; interior, 23. 54. One, 26 ft. by 4 ft. diameter. 55. 13 lbs. 56. 13 cwt.

Continuation of TABLE 1, APPENDIX VII. For Mean Speed.

6

APPENDIX VII. TABLE 1. Result of Experiments with the Yacht Undine,' July 6, 1858, on the measured mile at Greenhithe.
Immersion of Periphery, 1 ft. 8 in.
Displacement, 294 tons.

Diameter of Cylinder, 24 in.
Diameter of Screw, 7 ft. 10 in.

Draught of water, 8 ft. 6 in. forward, 11 ft. aft.

Length of Stroke, 15 in.

Pitch, 11 ft. 3 in. Length, 1 ft. 4 in.

Midsection, 154.33 square feet.

11.9

6 53 162-32 10-03 13.25

8a

6 16 159-58 10.99 13.25

8 11 146-32 8.44 12.6 7.32 10.94
5 33 172-04 12:45 13:36 10.8 11.26 1095-61175.4
7 39 162-58 9.03 12.86 7.84 11.16 795-01132.2
5 46 165-2
13.43 10-39 11.65 1054-21182
8.71 11.34 883.2 1166.4
9.54 11.34 967.2 1166.4

742.8 1109.4

33-14

Against tide, above 2 knots

and No. 3 wind.

86

Against tide. Nearly, if not
low water. Wind ahead.
About low water. Wind slight
astern.

15.75 11.6 10.6 22.2 103.72 650 15.75 11.66 11-03 22.69

15.8 12.29 10.70 22.98 101-74 669-71 6 35 157-09 10.66 13.00

4a to 86 Mem. of performance on trial, July 19, 1856.

16-41 12-88 10-75 23-54 103-53 664-00 6 25 164-32 11-02 13-34

...

Mean 108

Mean 162

9.92 13.5

8.6

11.69 872.96 11.88 26.25

Diameter, 6 ft. 6 in.; Pitch,
11 ft.; Length, 1 ft. 4. in.;
Draught forward, 8 ft. 3in.;
Draught aft, 11 ft. 3 in.;
Midsection, 148 sq. ft.

All sail set except mainsail.

APPENDIX VII. (continued).-TABLE 3. Result of Experiments with the Yacht Undine,' October 26th, 27th, and 28th, 1858.

12345678

APPENDIX VII. (continued.) Table 4.-Experiments with Yacht Erminia,' October 12, 1858, in Stokes Bay.

53 36.2
53 32.7
53 28.7
53 29.3
50 34.16
53 32.0

743 54-03 59.98 37.1

416 51-8 48-26 10-8

615 53-4 58-68 23.86 5.91 7-88 5.21 6.84 528.6 694.2

50 32.77
50 30.94

440 50.28 51.44 6.2 7.87 7.42 6.85 6.44 695.1 653-64

Ship. Screw. Ship. Screw. Ship. Screw.

With wind

and tide. Against wind and tide.

With wind and tide.

Report of the Proceedings of the Balloon Committee of the British Association appointed at the Meeting at Leeds.

THE Committee met at Burlington House, London, on the 29th November 1858: present—

Colonel Sykes in the Chair, Lord Wrottesley, Dr. Lee, and Mr. Gassiot on the part of the Kew Committee.

Mr. Gassiot read the resolution of the General Committee appointing the Balloon Committee; namely—

"That Colonel Sykes, Lord Wrottesley, Professor Faraday, Professor Wheatstone, Dr. Lee, and Professor Tyndall, be appointed a Committee to confer with the Kew Committee as to the expediency of arranging further balloon ascents, and (if it should be judged expedient) to carry them into effect; and that a sum of £200 be placed at their disposal, if it should be required for that purpose."

Mr. Gassiot, as Chairman of the Kew Committee, reported that, in consequence of the severe indisposition of General Sabine and of Mr. Welsh, he had not summoned the other members of the Kew Committee to attend this meeting.

Colonel Sykes read letters from Sir John Herschel and the Astronomer Royal, approving of further balloon ascents.

The question of expediency was discussed; and it was resolved, in consequence of the absence of three members of the Committee, and General Sabine and Mr. Welsh, to postpone the further consideration of the subject until the next meeting of the Committee, to be summoned by the Chairman.

Burlington House, 27th May, 1859.

Present, Colonel Sykes in the Chair, Lord Wrottesley, Professor Faraday, Professor Tyndall, and Dr. Lee.

Resolved,―That it is expedient for scientific objects that balloon ascents be renewed, due care being taken for the safety of the aëronaut, and the competency of the agents employed.

1859.

U