1. PMMA (polymethyl methacrylate) doped with a scintillating fluor 2 ft x 2 ft x ½ inch Read out by 10 stage EMI 9256 photomultiplier tube The Chicago Air Shower Array recycling retired detectors from the Chicago Air Shower Array located in the Utah Desert: 1089 stations, 15m spacing covering 0.23 square km

2. Barometric Pressure (mmHg) 727 747 4-Fold Coincidences / 2 hours 3000 4200 Statistical error bars shown 1.3% decrease per mmHg Marian High School’s Measurement of Cosmic Ray Rate vs. Barometric Pressure http://marian.creighton.edu/~besser/physics/barometer.html

3. Mount Michael Benedictine High School “The Science Teacher”, November 2001

4. Cosmic Ray Observatory Project Collecting Data with CROP DAQ Card Interface Doing an Efficiency Scan 1.Disconnect the 4 signal cables from the DAQ card. These are the cables that connect to your 4 detectors. 2.Open the CROP_DAQ LabVIEW Program. 3. Click on the "Efficiency" tab make sure the Efficiency Scan button is ON(lit up). 4. Click on the "Threshold Scan" tab make sure the Threshold Scan button is OFF. 5. Click on the "Data Collection Settings" tab and set the timer ON (green button lit up). 6. Click on the "Data Acquisition" tab and to begin run click on (upper left corner under the Edit menu). http://crop.unl.edu/tutorials/ Online help and tutorials available.

5. On-Line Oscilloscope Cheat Sheets http://unlhep2.unl.edu/~CROP/oscihomepage.html