%git PHILOSOPHICAL TRANSACTIONS. [anNO iCsC. 



Account of an Engine that consumes Smoke. By. Mr, Justel, Rt S. S. 



N° 181, p. 78. 

 M. Dalesme, engineer, has found out a machine, which, though very small 

 and portable, consumes all the smoke of all sorts of wood whatever ; and that 

 in such a manner, that the most curious eye cannot discover it in the room, 

 nor the nicest nose smell it, although the fire be perfectly open. This engine 

 is made after the manner represented in fig. 6, pi. Q, and is composed of several 

 hoops of hammered iron, of about 4 or 5 inches diameter, which shut into 

 each other. It stands upright in the middle of the room, on a sort of trevet 

 made on purpose. A is the place where the fire is made, where if you put little 

 pieces of wood, it will not make the least smoke, neither at A nor B, over 

 which you cannot hold your hand within half a foot, because of the great heat. 

 If you take one of these pieces of wood out of the fire, at A, it smokes pre- 

 sently, but ceases immediately, as soon as it is cast in the fire again. The most 

 foetid things in this machine make not the least ill scent ; on the other side, all 

 perfumes are lost in it, and incense makes no smell at all, when burned in it ; 

 which only happens when the fire at A is well kindled, and the tunnel B D very 

 hot ; so that the air that feeds the fire cannot come that way, but must all press 

 in upon the open fire ; by which the smoke and flame are all forced inwards, 

 and must pass through the heap of burning coals in the furnace A ; in which 

 passage its parts are so dispersed and refined, that they become inoffensive, 

 both to the eye and nose. 



The two New Interior Satellites of Saturn discovered. By M. Cassini, at the 

 Royal Observatory at Paris. N° 181, p. 79- 

 The first or innermost satellite of Saturn, by the observations hitherto made, 

 is never distant from his ring above two thirds of the apparent length of the 

 same ring, which is taken for the measure of the distances of these satellites : 

 and it makes one revolution about him in one day, 21 hours and 19 minutes. 

 Therefore, in less than 2 days it makes two conjunctions with Saturn, the one 

 in the upper part of his orbit, and the other in the lower ; and the ring taking 

 up the greatest part of the diameter of the orbit, in which this satellite makes 

 its revolution, these conjunctions are of a long continuance, in respect of the 

 whole revolution, it being 8 hours and a half, and sometimes more in passing 

 the length of the ring. This happens particularly, when the position of the 

 ring, in respect of the earth, being very oblique, it appears very narrow ; and 

 the orbit of this satellite being nearly in the same plane with it, they appear 



