 The Giesl ejector ensures improved suction draught and a correspondingly better use of energy.The existing blastpipe in a locomotive is replaced by several, small, fan-shaped, diverging blast pipes, from which the diffuser gets its flat, long, drawn-out shape.Giesl claimed that his ejector enabled a saving in coal of between 6 and 12% – although in practice the maximum saving was more like 8% – and an increase in power of up to 20%.