The Haverford aging chamber uses the same lighting, image acquisition, humidity control, and heating hardware as the first generation chamber. However, image acquisition of smaller samples (necessitating a shorter focal length and higher magnification) is more sensitive to refraction from changes in ambient temperature within the chamber. As the chamber comes up to temperature, the image from the camera distorts due to the changing temperature gradient in the air. Hardware modifications were made to reduce air temperature fluctuations within the chamber. The chamber needed to be preheated to stable operating temperature before samples were loaded and to return to thermal equilibrium quickly after loading. To accomplish this, the Haverford chamber has a different enclosure