A method for injecting a fluid medicament into a patient uses a syringe having a plunger that can be advanced into the syringe chamber. A conveying member which conveys the developer in the longitudinal direction is disposed only in the developing section, and a mixing member which does not positively convey the developer in the longitudinal direction is disposed in the mixing section. In addition or alternative to oilfield applications, the principles of the present invention contemplate separation in a laboratory or other environment for biological sample separation and analytical chemistry applications. The vacuum cleaner attachment further includes a vacuum cleaner receptacle formed in the chassis and adapted to receive a vacuum cleaner and corresponding power brushroll. The bidirectional beam can be coupled to many types of optical systems, including optical phased arrays, multi-beam laser transmitters and receivers, telescopes, and high energy laser beam control systems. Thereby, the amorphous carbon is removed from the tip end of the fibrous carbon substance of the field emission type electron gun, without the tip end thereof being damaged.