The Art of projection and complete magic lantern ... - Yesterday Image

74PURIFIER OR WASHBOTTLE.It is a great mistake with the majority of purifiers made, that they aretoo shallow. A washbottle to be of any service should be filled withwater to a depth, say eight or ten inches, and the gas from the retort takento the bottom and allowed to pass through the whole ten inches. Tocleanse and wash the gas properly, two purifiers should be used, the gasafter passing through the first is made to go through the same routinewith the second, even after the gas has passed through the purifier it willbe noticed that there is a strong disagreeable smell with it, and asthere is no smell from pure oxygen some other product must bepresent, in proof it is found to be chlorine, given off from the potash, ofwhich it is one of the component parts, it is this gas that destroys thegas bags, and corrodes the brass taps of our jets, and the more washingwe give the gas the greater the chance of throwing this down. A handfulof common washing soda or the old limes and dust should be throwninto the purifier ; after the chlorine has been taken up by this, wehave a residue of chloride of lime.Fig- 37-The illustration shows the method of making the connection with theretort and purifier. C is the brass top to retort, which unscrews forwashing out ; D is the cork which acts as a safety valve in the case ofany stoppage, and should not fit too tightly ;A is the rubber tubingconnecting retort to purifier, and should be of a wide bore ; B is theoutlet tube, which is connected by rubber tubing to the bag. E is theaverage height to which the purifier should be filled with water.