STABILITY, PROPULSION, AND SEA-GOING QUALITIES OF SHIPS. 39 



Scott Eussell, Eeport to British Association for 1844. Also, 'Modern 

 Naval Architecture.' 



Stokes, ' Cambridge Transactions,' 1842 and 1850. 



Earnshaw, ' Cambridge Transactions,' 1845. 



Proude, 'Transactions of the Institution of Naval Architects,' 1862, 

 p. 48, and (incidentally) in his papers " On Rolling."' Also, " Remarks on 

 the Differential Wave in a Stratified Fluid," Trans. I. N. A. vol. iv. for 

 1863, p. 216. 



Rankine, ' Philosophical Transactions; for 1863 ; ' PhU. Mag.,' Nov. 1864 ; 

 ' Proceedings of the Royal Society,' 1868 ; also, ' Shipbuilding : Theore- 

 tical and Practical.' 



Cialdi, ' Sul Moto ondoso del Mare.' 



Caligny, papers in LiouviUe's Journal, 1866. 



T. Stevenson, ' On Harbours.' 



"With regard to the rolling of ships in wave-water, we believe that almost 

 the only exact investigations are to be found in the ' Transactions of the 

 Institution of Naval Architects,' some of which have been reproduced in 

 ' Shipbuilding : Theoretical and Practical,' and reprinted in the ' Engineer ' 

 and in ' Engineering.' They are as follows : — 



Proude, " On the Rolling of Ships," vol. ii. for 1861, p. ISO, with Ap- 

 pendices, vol. iii. pp. 45 & 48. 



WooUey, " On the RolHng of Ships," vol. iii. for 1864, p. 1. 



Crossland, " On Mr. Proude's Theory of RoUing," vol. iii. p. 7. 



Rankine, on the same, vol. iii. p. 22 ; " On the Comparative Straining 

 Action of different kinds of Vertical Oscillations upon a Ship," vol. iv. for 



1863, p. 205. 



Scott Russell, " On the Rolling of Ships," vol. iv. p. 219. 



Proude, " Remarks on Mr. Scott Russell's Paper," vol. iv. p. 232. 



Scott Russell, rejoinder, vol. iv. p. 276. 



Woolley, Mem. on same subject, vol. iv. p. 2S4. 



Rankine, " On the Action of Waves upon a Ship's Keel," vol. v. for 



1864, p. 20. " On the Uneasy Rolling of Ships," vol. v. p. 38. 

 Lamport, " On the Problem of a Ship's Porm," vol. vi. for 1865, p. 101. 

 Proude, " On the Practical Limits of the Rolling of a Ship in a Sea-way," 



vol. vi. p. 175. 



Reed, " On the Stability of Monitors under Canvas," vol. ix. for 1868, 

 p. 198. 



An abstract of the leading principles will be found, as already stated, in 

 ' Shipbuilding : Theoretical and Practical,' edited by Mr. Rankine. 



Some valuable practical observations on the roUing of ships in waves will 

 also be found in a pamphlet, ' Du Roulis,' by Captain Mottez, of the 

 French Imperial Navj-. 



Measurement of Waves at Sea. 



This is a thing which has seldom been done with any degree of accuracy. 

 Not only is the vessel moving, but the apparent direction of gravity is not 

 the true one. The result is, that the difference of direction between the 

 tangents to two waves from a point a little behind the spectator is generaUj- 

 taken for the apparent angular height. This may evidently be far in excess 

 of the true apparent height *. 



* See Mr. Kankiue's " Ecmarks," Trans. I. N. A, vol iii. p. 27. 



