63 REPORT— 1867. 



ampton to St. Thomas, between June 3, 1861, and June 17, 1862, as given in the 

 preceding Tables. 



" Table XVIII A.— Table of diagrams from indicator and working of engines, 

 showing the manner in which the summaries in the above Table ai'e obtained." 



In both these Tables dimensions are wanting. 



" Tnble XIX. — Eeturn of particulars of the dimensions of the Peninsular nnd 

 Oriental Steam Navigation Company's Steamship * Moultan,' with tabulated 

 statement showing the results of her performance as compared ■with six other 

 vessels in the same service." 



" Table XX. — Table of results of the performances of sixtj^-eight vessels of the 

 Imperial and Royal Austrian Lloyd's Steamship Company." 



No dimensions of ships nor indicated horse-power are given in this Table, 



"Table XXI.— Table of experiments with Her Majesty's Gunboat 'Stork.' " 



No displacement given. 



"Table XXII. — Eight logs of voyages of the 'Great Eastern.' " 



Of the eight logs only three are returned with the indicated horse-power ; 

 and those are used in the condensed Tables. 



"Table XXIII. — Dimensions and abstract of performances of the Pacific Steam 

 Navigation Company's new paddle-wheel steamships ' Peru' and ' Talca.' " 



No dimensions of wheels are returned. 



" Table XXIV. — Abstract log of, and notes upon, the performances of the African 

 Eoyal Mail Company'.s steamship ' M'Gregor Laird.' " 



" Table XXV. — Notes on the performance of the North German Lloyd's Com- 

 pany's steamship ' Ilausa.' " 



"Table XXVI. — Log of the Earl of Durham's sailing yacht ' Beatrix ' on her 

 recent Mediterranean vo3'age." 



The Tables published in the Eeport of the British Association for 1863, 

 and various data as to the performance of steam-vessels which have been 

 obtained from other sources, still remain to be coudoused, in the event of the 

 reappointment of this Committee. 



Method of Condeiisation. 



The following method of condensation was drawn up by the Committee in 

 order that it might be followed as far as practicable. In some cases the 

 nature of the data rendered deviations from the method in matters of detail 

 unavoidable ; but its principles have been adiiered to throughout. 



1. All results belonging to any special theory, and aU quantities calculated 

 approximately by inference, or ascertained otherwise than by dii'ect mea- 

 surement, to be excluded from the condensed Tables. 



2. Vessels for which any of the essential data (marked E in. the annexed 

 list) are wanting to be excluded. 



3. The remaining vessels to be divided into groups, according to their 

 speed on trial ; for example, — 



Group 1, below 7 knots. 



