may 26/RUN

3.1 miles
austin, mn
55 degrees

Not too humid or too hot or too stinky from the Hormel plant. A great morning for a run in Austin. Ran past the high school track, the high school, downtown, Paramount theater, and the creek with Scott. Don’t remember much except for feeling strong and steady and that it wasn’t too hard.

Looking through diagram, I found this piece about the dew point. It’s in the schematics section. I don’t quite understand it (yet), but I’m interested in the dew point and have written about it before so I thought I’d include it here.


Franklin W. Kirk and Nicholas R. Rimboi, Instrumentation, Third Edition, American Technical Society, 1975

The typical instrument for measuring dew point is shown [at right]. It uses a gold-plated mirror surface which is bonded to a copper themistor holder. This assembly is chilled by a Peltier effect thermoelectric cooler. (The Peltier effect is discussed in Chapter 10.) The air or other gas being measured for dew point is passed by the mirror. A neon lamp is beamed on the mirror which reflects the beam toward a photoelectric resistor. As dew forms on the mirror and clouds it, there is a change in the amount of light reflected. This change is dected by an optical sensing bridge.