Expand all + Luminosity 6B10.15 - Inverse Square Model6B10.30 - Paraffin Block Photometer6B10.50 - Frosted Globe - Surface Brightness6B10.55 - Frosted Globes with Photometer + Blackbodies 6B40.10 - Variac and Light Bulb6B40.20 - Hole in a Box6B40.40 - Blackbody Curves6B40.50 - IR Camera and Stove Element6B40.90 - Thermal Imaging Camera and Student