Abstract: A fluid cartridge having a plastic fluid body, a bottom wall having a fluid supply opening therein. An insert is adhesively fastened to the bottom wall. The insert has a fluid supply slot therein corresponding to the fluid supply opening in the bottom wall, a die bond surface adjacent to the fluid supply slot for adhesively fastening an ejection head chip thereto, and a plurality of air vents adjacent to the die bond surface. The insert is a material selected from an epoxy molding compound and a ceramic material. An ejection head chip is adhesively fastened to the die bond surface of the insert.

Abstract: According to the invention there is provided radar simulation apparatus comprising an oscilloscope having a display screen, said oscilloscope producing a luminous movable screen spot, scanning means connected to the oscilloscope for causing the spot to be scanned over said screen in a radar transmitter type scanning pattern, a photo-detector mounted in front of the screen for detecting light from said spot only when said spot is near the photo-detector and for producing an electrical signal when said light is detected, and modulation means connected to receive and modulate said electrical signal in simulation of a radar pulse repetition.