CONDENSED CASES, 233 



The buTitlines and reef line will confine the fiack fail, 

 when reefed, ciofe up ihe wake of the reef bands; and the 

 buntlines will only require to be kept hand tort, as is ufua!, 

 to prevent them from chafing the fail. 



The flack fail of the roof of the top fail, will be kept, 

 extended tort acrofs the foot, by the reef pendants palling 

 through cringles in the leech. 



The ends of the clewlines may likewife pafs through cringles, 

 jn the leech of the top gallant fails if neceffary. 



The reef lines, if neceffary, may be in fepafate pieces, 

 made faft in the middle and quarters of the fail. 



XI. 



Experiments on condenfcd Gafcs. Bj/ T. Nokthmore. 



To Mr. NICHOLSON, 

 SIR, 



I NOW take the liberty of prefentlng you with a con- Experiments on 



,jf- c iU conacnfed gai-s, 



Imuation of rnv experiments upon the condenlation ot tne 



gafes, but firft beg leave to make one obfervation, viz. that 

 the quantity of gas faid to be injeded in each experiment, 

 cannot (particularly in the preceding article) always be 

 depended upon ; for its tendency to efcape is fo conftant and 

 powerful, as frequently to elude every effort of mine to 

 prevent it, and if it can find no other exit, it will fometimes 

 efcape by the fide of the pifton of the forcing pump. In the 

 preceding experiments I have endeavoured as much as pofllble 

 to obviate this evil, but not always with the fuccefs that I 

 could wiQi. 



Repeating the eighth experiment mentioned in my former Nitrogen con- 

 lelter, (fee Vol. XII. p. 372-3 ) viz. the condenfation of jj^^/^y^^Ld 

 nitrogen upon lime*, iu order to difcover the caufe of the nitrate. 

 lofs of colour in the nitrogen, I perceived that this arofe from 

 its fixation, and a nitrate of lime was the refult. This ex- 

 periment, on account of the elallicity of nitrogen previous 

 to its change of habitude, requires fonie caution ; for one 

 of my beft receivers, three-eigblhs of an inch thick, was 



* Your marginal note fays erronoeufly Uvie-'water. 



Ihivered 



