The two dangling thermometers (side-by-side) hang in front of an orifice which is the opposite end of a tube connected to the aspirating motor (via a pre-heater hose to a car) connected outside of the shelter (outside to radiate heat from the motor away from the measuring devices.) I ran an underground conduit to the weather shelter from a nearby electrical source and put a switch to activate the aspirator inside the shelter. The cylindrical chrome device to the far left is the *psychrometer which has a built in motor which draws air past its two thermometers. The switch operates both devices simultaneously, and the result is a high level of accuracy.

The small glass container at the bottom of the photograph is filled with distilled water for wetting the wet bulb's wick.