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

3tserve to distribute the same to the jets. These pipes are connected asfollows — :The top pipe on left hand side of the dissolver (hydrogen) isattached to top jet (same side), and the bottom left hand side of dissolverto bottom jet. The top right hand side of dissolver (oxygen) is nowattached to bottom jet, and the bottom pipe is fixed to the top jet, asshown in illustration.HydrogensupplyOxygensupplyWhen the handle or lever attached to the plug of dissolver is horizontal,gases are being supplied to both jets, but when the handle is moved upor down, only one jet is being served. The small taps each side of thedissolver are the bye-pass, or leaks, which serve a small flame to the jetnot in use and may be regulated to suit the pressure at the main.The hydrogen leak should play about one inch up the lime, and ifblow through or safety jets are used a little oxygen leak should also beon, but very little, just sufficient to give the appearance of a blue pea inthe hydrogen flames. This leak of oxygen prevents the jet poppingwhen it is dissolved on. And the hydrogen leak to keep the shut off jetfrom going altogether out. The dissolver may thus be turned on andoft", and no re-ignition of the jet is necessary.When using chamber or mixed gas jets, the oxygen bye-pass shouldnot be used, but shut off entirely. If a double dissolving tap is used^one lantern only can be turned off at the time. And after adjusting thejets, or during an interval, when it is necessary to lower both lanterns,one must be necessarily lowered at the jet taps, which means readjustmentof the gases at the jet, before it can again be brought into play.Another point in using a double tap, it is not quite clear to the noviceat a first glance, whether the top or bottom lantern is on or off.