508 



APPARATUS FOR THE 



passed through the gauze, and appeared at the bot- 

 tom of the tube. The same kind of wire-gauze was 

 next placed at a and b, and then at a, b and c, at 

 the same time ; and the flame passed through all 

 the pieces. This effect was also obtained, when si- 

 milar pieces of wire-gauze were put at all the five 

 joinings of the tube at once. In this last result, 

 the first piece of wire-gauze was 4J inches from the 

 top (A); the second 8j; the third 12; the fourth 

 16 ; and the fifth 20 ; and the flame appeared at 

 the bottom, after a passage of 23 i inehes through 

 five pieces of the wire-cloth. 



Experiment 14. — As 1 could not get the flame 

 to i pass through the whole of the tube, when I en- 

 creased the joinings beyond 23 \ inches, it was im- 

 possible to try an additional number of pieces of 

 wire-gauze, by adding them in the same way. I 

 therefore increased the number, by putting more 

 than one at the same joining. I found, upon re- 

 peated trials in this way, using the tube 15 inches 

 long, as shewn on Plate XXIV. Fig. 1. that the 

 flame could pass through 3, 6, 9 and 12 pieces at 

 once ; these being placed 1, 2, 3 and 4 pieces at 

 each of the joinings a, b, and c. 



Experiment 15. — Although, by the two last ex- 

 periments, it was proved that the flame could pass 

 through the coarser wire-gauze when increased even 

 to 12 pieces, yet it did not follow that it was not 

 thereby altered somewhat in its nature. A probable 

 change was, that it might become innert with re- 



