Today I added photos and descriptions of the hygrometers in my instrument collection. This includes wet bulb hygrometers, hair hygrometers, and coil hygrometers. I also added a recent addition to my barometer collection, a Yanagi 8A. Next task is to add the thermometers.
I also added a 15 page excerpt from a 1933 W M Welch catalog showing the meteorological instruments that they supplied. It's in the US instrument catalog section.