A pressure roller for textile machines, in particular for a texturing machine, is provided. The inlet opening of the sprinkling unit is connected, with respect to the direction of said water flow, downstream of the tank through the connection element with the outlet of the tank, in such a way that the water flowing out of the tank enters the sprinkling unit through the inlet opening. The containers are disclosed as being useful for protecting photo-sensitive products while allowing the color of those products to be displayed to the user. The middle portion of the bridge is bonded to the substrate to provide a compressed crystalline semiconductor layer on the substrate. This enables the waveform of the tune involving a modulation to be analyzed with a reduced operation amount. The projection optical system includes lenses for projecting color beams onto a screen.