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

;Having blown through every tube to make sure of no obstruction,place the mixture in the retort and see that the cork in the retort isfitted tight and yet easy, take the purifier (three parts filled with water,in which some soda or lime has been placed) and connect by means ofrubber tubing with retort, use only best pure rubber for this purpose,wire tubing is useless, soon clogging up with the manganese, previous toconnecting, blow through the purifier with the breath and note if anywater is splashed out, if so, it is too full and a little must be emptied out.Having connections according to illustration, place retort on a fire nottoo fierce, and, before making the connection to the bag, allow a littleof the gas- to escape through the purifier ;in the purifier the first few bubblesheard is only air, after a short time a rapid generation of the gascontinues and the tubing may now be connected with the bag. Noticethat the tap of the latter is left open. Should the gas come off withviolence through the fire being too fierce, the retort should be lifted off"without disarranging the apparatus, and after a few minutes, replaceddo not wait for it to stop before doing this, or there will be a littledifficulty in getting the heat to penetrate through the already spentchlorate. When the gas has entirely come off, which is known by thecessation of the bubbles in the purifier, detach the tubing from retortand allow it to cool, the purifier may be used as it is agam and again,of course washing out the tubing connecting same with retort. Theretort having cooled, unscrew the top and invert same over a sheetof paper, and if there is any mixture not used it will fall out, the usedup chlorate remaining solid at the bottom. This and the delivery tubeshould all be washed out with several successions of water, the wholedried on a fire and put away ready for use next time.MANUFACTURING HYDROGEN GAS.This gas we are perfectly familiar with in the form of coal gas, thisis not pure hydrogen, but carburetted hydrogen, and is as equallysuited for limelight as pure hydrogen, without doubt the illuminosity isequal, and as it is the chief illuminant in all large towns the bag can befilled by attaching with rubber tubing to the ordinary gas branch,the bag will naturally fill quicker if the burner is first unscrewed.In the Colonies and places abroad, this is not always possible,as many towns are not illuminated with gas, and there is a certainamount of uneasiness in travelling with a bag filled with hydrogenalthough there is no need for any apprehension, as it is constantly done,especially in cases where the lanternist knows the gas in the town or