Figure 3 displays a three-dimensional bar graph that shows the test results for the rise in temperatures inside six different colored hardhats during the coolest and warmest hour of the day. The front row of bars (colored red) represent the increases in temperature inside the different hardhats during the warmest hour of the day. The back row of bars (colored blue) represent the increases in temperature inside the hardhats during the coolest hour of the day.

Going from left to right along the x-axis of the graph, the first bar represents the results for the white hardhat. It shows that on average the temperature inside the hardhat was half a degree Fahrenheit cooler than the ambient air during the warmest hour of the day, and that it was 1.3 degrees Fahrenheit warmer than the ambient air during the coolest hour of the day.

The next bar illustrates the temperature inside the black hardhat. It shows that on average the temperature inside the hardhat was 2.7 degrees Fahrenheit warmer than the ambient air during the warmest hour of the day, and that it was 10.2 degrees Fahrenheit warmer than the ambient air during the coolest hour of the day.

The next bar illustrates the temperature inside the red hardhat. It shows that on average the temperature inside the hardhat was 1.4 degrees Fahrenheit warmer than the ambient air during the warmest hour of the day, and that it was 6.8 degrees Fahrenheit warmer than the ambient air during the coolest hour of the day.

The next bar illustrates the temperature inside the blue hardhat. It shows that on average the temperature inside the hardhat was 1.6 degrees Fahrenheit warmer than the ambient air during the warmest hour of the day, and that it was 8.1 degrees Fahrenheit warmer than the ambient air during the coolest hour of the day.

The next bar illustrates the temperature inside the yellow hardhat. It shows that on average the temperature inside the hardhat was nine-tenths of a degree Fahrenheit warmer than the ambient air during the warmest hour of the day, and that it was 3.4 degrees Fahrenheit warmer than the ambient air during the coolest hour of the day.

The next bar illustrates the temperature inside the orange hardhat. It shows that on average the temperature inside the hardhat was one degree Fahrenheit warmer than the ambient air during the warmest hour of the day, and that it was 4.2 degrees Fahrenheit warmer than the ambient air during the coolest hour of the day.