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

79The Duplex.—The chieffeatureconsists in the combination of tworegulators, in order that any defect in"]the action of the first shall be correctedby having to pass a second. Thisinsures efficient action over a muchwider range of pressures, as the fullsupply is maintained until the pressure at the inlet has decreased to onethirdof an atmosphere.The Metallic Regulator is constructed somewhat on the style ofBeard's, with this difference, that the bellows instead of being of rubber,is of spun metal, it is very well made, and certainly has the advantageof lasting a long while ; as this bag rises and falls, so it opens and closesthe valve inlet by means of a lever and other mechanical adjustmentsinside the metallic bellows.DIRECTIONS.— Attach by the winged union to the cylinder, first takingcare to clean thoroughly the joint surfaces, and connect by a stout rubber tube to theapparatus requiring the supply of gas.When not in use, close the cylinder valve to prevent pressure accumulating in theregulator and tubine-As before mentioned, a single regulator to reduce the pressure fromiSoolbs. on the square inch, to something like 8 inches on a column ofwater is more than can reasonably be expected, especially to regulate thepressure evenly for one or three lanterns. There is no single regulatorthat will give the uniform pressure of a gas bag. When tested on a Ushape water gauge, it will be found that the pressure shut off from aregulator will never be twice alike, and as a rule it will blow the watercompletely out of the tube, and we know in trying to work threechamber jets in a triple, when there is sufficient pressure for one jet,