*Straight-in cathode ray tube This product demonstrates the phenomenon that the cathode ray tube moves in a straight line and can be blocked by metal. *The product consists of blister, metal baffle, bracket, cathode, anode, bakelite seat, etc. *Demonstration of straight into the cathode ray tube is best carried out in a dark room. *During the demonstration, A2 emits cathode rays, and a shadow with the same shape as the metal baffle will appear on the glass wall of the large-end screen of the ray tube. Bright yellow-green fluorescence appeared on the glaze around the shadow.it can be explained that the cathode ray moves along a straight line, and its ability to penetrate the metal sheet is very weak. *Scope of application: Teachers teach in laboratory classrooms to increase students' interest in physics and electricity