Abstract: A fire suppression nozzle can include a first fluid channel configured to be in fluid communication with a first fluid having a first flow velocity and a second fluid channel configured to be in fluid communication with a second fluid having a second flow velocity. A mixer can be disposed between the first fluid channel and the second fluid channel such that the mixer is configured to induce streamwise vorticity in at least the first fluid exiting first fluid channel to cause mixing of the first fluid and the second fluid to reduce a flow speed of a mixture of the first fluid and the second fluid.

Abstract: A suspended scaffold may be hung from a skyscraper, a ship's side or other structures where work on a surface is done by the workers on the scaffold. The surveillance system is a frame removably hung on the rails of the scaffold. A TV camera and transmitter is mounted to the frame. A remote TV/receiver allows a person on the ground to view the condition of the building. Optional pan, tilt, zoom features and a tilt alarm are disclosed.