IMPROVED ship's STOVE. 337 



iiiea, at equ^ temperatures, appears to be in the ratio af 



the volatility of the liquors that furnish them. The most 



volatile bodies are those, which, in similar circumstanceSj 



produce the heaviest elastic vapours. 



Observations made by several natural philosophers indi- Gasses mix unl- 



cate, that masses of different natures mix uniformly, and^^"^™'?^ without 

 ^ ° _ •' ■' regard to speci- 



do not arrange themselves according to the natural order of fie gravity. 



their different specific gravities: but if this observation 

 •Vfere unfounded, if the vapours that emanate from the ter- 

 restrial globe arranged, themselves in the order of their gra- 

 vities, those that belong to the least volatile bodies^ as the 

 earths and metals, would be those that would occupy the 

 highest strata of our atmosphere, supposing its temperature 

 uniform. 



II. 



Description of an improved Ship's Stove, hy Mr. Joseph 

 Collier, No, 11, Crozi:n Street, St>ho*. 



SIR, 



1 HEREWITH send you a model of an improved ship 

 stove, which may also be employed in drying houses, &c., 

 with more safety than those in present use. 



I submit it to the inspection of the members of the So- 

 ciety, who, I make no doubt, will see its advantages, and 

 am, Sir J 



Your humble Servant, 



JOSEPH COLLIER. 



P. S. The expense of one twelve inches diameter will be 

 about eight pounds. 



Fig.l, Plate IX, represents the stove, with the front Description of 

 partly closed by the circular slide A, which is moved from ^ ^^'^'^ ^^°^^- 

 the back by the brass handle B. C a movable plate attached 

 to the slide A, now supported by the latch catching a pin, 



* Transactions of the Society of Arts, vol. xxv, p. 93. Fifteen 

 guineas were voted to Mr. Collier for this invention. 



Vol. XXI. — Supplement. Z ^y 



