198 REPORT 1860. 



Railway Company, are the mean of a number of trips on actual service be- 

 tween Holyhead and Kingstown. The returns of the ' Erminia,' 'Admiral,' 

 ' Emerald,' aud ' John Perm,' are measured mile performances only ; but the 

 remaining 12 vessels, with the exception of the 'Undine,' show their sea 

 performances over distances of about 6000 consecutive nautical miles each, 

 in addition to the performances on the measured mile. 



3. Return of the results of performance of 49 vessels in the service of the 

 Messageries Imperiales of France, recorded in the form used by that Com- 

 pany. The whole of these vessels are given in the Appendix. (Appendix I. 

 Table 2.) 



4. Quarterly returns of the speed and consumption of coal of the London 

 and North-Westeru Company's express and cargo boats, under regulated con- 

 ditions of time, pressure, and expansion, from January 1st to December 31st, 

 1859 — presented by Admiral Moorsom. (Appendix II. Table 1.) 



Half-yearly verifications of the consumption of coal of the above vessels, 

 from January 1st to December 31st, 1859, (Appendix II. Table 2.) 



5. Forms of log-book used by the Royal Mail Company (Appendix III. 

 No. 1), by the Pacific Steam Navigation Company (No. 2), by the Peninsular 

 and Oriental Mail Company (No. 3), the Admiralty form for recording trials 

 of Her Majesty's vessels (No. 4), and the Board of Trade form of return of 

 capabilities (No. 5). 



6. Table showing the ratio between the indicated horse-power and the 

 grate, the tube, the other heating and total heating surfaces ; also, between 

 the grate and heating surfaces, and between the indicated horse-power and 

 coal consumed. (Appendix IV.) 



From the above list, it will be readily conceived that the time of the Com- 

 mittee has been fully occupied, as the task of copying and condensing from 

 log-books is one involving a large amount of labour. Your Committee have 

 not therefore, as yet, been enabled to conduct experiments on the plan 

 recommended in their first Report presented to the Association in Aberdeen. 

 They have, however, kept that branch of their inquiry in view; and through 

 the courtesy of Mr. A. P. How, of Mark Lane, and of Messrs, Tylor and 

 Sons, of Warwick Lane, they have been presented with apparatus of the 

 value of about £60, consisting of salinometers, and an engine counter and 

 clock ; they have also at their disposal, for use whenever required, a superior 

 dynamometer, and a compound stop-watch, and are now prepared to pro- 

 ceed with experiments, should the Association see fit to renew their powers, 

 and the consent of the Government be obtained. 



The Committee regret that they have not been able to collect any such 

 information respecting the performance, under sail alone, of steam- vessels, 

 as was contemplated by the Association, " with a view to comparing the 

 results of the two powers of wind and steam, in order to their most effective 

 and economical combination." 



They must, however, draw attention to the synopsis given by Mr. Isher- 

 wood, of the steam-log of the ' Niagara,' in which her performances, " under 

 steam alone," " under steam and fore-and-aft sails," and " under steam and 

 square sails combined," are set forth in such manner that those conversant 

 with the subject will be enabled, without much difficulty, to assign its approxi- 

 mate value to the power of the sails alone. 



In Mr. Archbold's Table of the performance of the ' Wyoming,' the addi- 

 tional particulars of the force of the wind by notation, the area of sail set, 

 and the indicated horse-power, which are not always stated in Mr. Isher- 

 wood's synopsis, afford the means of tolerably accurate comparison. 



It is a duty the Committee owe to themselves, to express thus publicly 





