188 Miscelianeous IrUeUisrence 



to' 



64, and by the strong spirits 88. Now the difference . between 

 40 and 64, is 24, and between 40 and 88, is 48. Hence the 

 following proportion 24 : 48 : : strength of the dilute : strength 

 of the strong spirits. This I have tried with different propor- 

 tions of spirits and water, in different states of the atmosphere, 

 and found the same property uniformly obtain. The experiment 

 requires to be performed with great delicacy and care, as the 

 spirits soon acquire their maximum, after which the fluid in 

 the stem begins to ascend." — Annals of Philosophy ^ xvi. p. 215. 



17. Electrical Experiment, — The following experiment is 

 described by Professor Moll. Place a thin piece of tinfoil 

 vertically between two horizontal and insulated rods of brass, 

 each terminated by a knob, and distant from each other between 

 one and two inches, then pass from one to the other a strong 

 cbarge of a large electrical battering. The plate of tin will be 

 found pierced by two holes, with their burs in opposite di- 

 rections. That the experiment may succeed, the tin foil should 

 be thin, and the charge strong, otherwise only two impressions 

 will be seen on the plate. 



18. Improvement in Dyeing. — Cloths which are dyed in the 

 piece, frequently present at the edges a line corresponding to 

 the middle of the piece of cloth, more lightly dyed than the 

 surface. This sometimes produces a disagreeable effect. From 

 the Count de la Boulaye-Marsillac's experiments, it appears to 

 be occasioned by the water which remains in the wool before 

 immersion in the dye stuff, from the previous wetting process. 

 This water either excludes or dilutes the dye, and renders it less 

 effectual within the cloth than at the surface. To obviate this 

 the Count makes the cloth pass through rollers within and at 

 the bottom of the dye-vat, by which the mere water is very com- 

 pletely expelled, and the dye takes its place. In passing the 

 cloths backwards and forwards in the dye-vat, they are made 

 each time to go through the rollers. 



Scarlet cloths thus dyed are so intense in colour as to appear 

 less bright than common scarlet, but this is obviated by adding 

 turmeric or fustic to the bath. 



