Part 1 of Essay
In , particles ionize gas atoms. The tube contains a gas at low pressure. At one end of the tube is a very thin ”window” through which charged particles or gamma rays pass. Inside the tube is a copper cylinder with a negative charge. A rigid wire with a positive charge runs down the center of this cylinder. The voltag ....

Part 2 of Essay
.... voltage is amplified and registers the arrival of a particle by advancing a counter or producing an audible signal, such as a click. The potential difference across the tube so that the current flow stops. Thus the tube is ready for the beginning of a new avalanche when another particle or gamma ray enters it. ....