334 Miscellaneous Intelligence. 



ninths of the distance between the two masts of the vessel, esti- 

 mated from the main-mast, possesses the remarkable property of 

 preserving its minimmn intensity in every position of the vessel. 

 — Ibid. 



In moving the ship's head from one position to another, the 

 motion of the centre of force is in that species of line which 

 geometers denominate A Curve of double Curvature. — Ibid. 



In the Helicon brig, having all her guns and stores on board, 



the means of the intensities of the three sections, as far as the 



transverse line of stations, just abaft the main-mast, were found 



to present a remarkable approximation to equality ; being for the 



Starboard section 111*92, 



Middle section 111*78, 



Larboard section 111-08, 



the ship's head being moored towards the north ; but the means 



of the intensities of the former and latter sections, estimated 



from the before -mentioned transverse line of stations, to a similar 



line abreast of the foremast, were for the 



Starboard section 105*23, 

 Larboard section 95*67, 

 the former exceeding the latter in the ratio of 1 1 to 10. 



The intensity in the after part of the ship is much more con- 

 siderable than in the forward part ; for the 



Mean intensity of seven stations in thei . , ^.^ •»«■ 



after-part of the starboard section J I iiq«'55 



Mean intensity of seven stations in the") , . ^ „ f 

 after-part of the larboard section j J 



Mean intensity of seven stations in the)^ ioo*77lMean * 

 forward part of the starboard section/ I gg.go 



Mean intensity of seven stations in the "1 00.071 

 forward part of the larboard section/ J 



The variations of intensity at different stations in a ship are 

 of a very unequal kind. In some parts, the alteration of a quar- 

 ter of a point in the direction of a ship's head is productive of a 

 greater change than the variation of an entire point at some other 

 stations. — Ibid, 



For the Impregnable, a ship of 104< guns, Mr. Harvey found 

 that, in passing from the mean intensity of the poop to that of 

 the quarter-deck and forecastle, there is a decrease amounting to 

 2*42 ; from the deck last-mentioned to the main-deck, a feeble 

 increase of 0*03 ; from the main to the middle-deck, a diminu- 

 tion of 4*43 ; from the middle to the lower deck, an increase of 

 4*59 ; from that to the orlop-deck, a decrement of 6*88 ; from 



* Mr. Harvey has requested us to correct an error, info which he has been 

 led by the inadvertency of a friend^ respecting the scharps of the beams of the 

 deck being secured by bolts of iron, whereas he now finds thenai to be copper. 

 «*-See Note, page 328 of the Transactions. 



