An e-mail from Gary recalls an instrument using thermometers to determine humidity and wants to know what it is. It's called a sling Psychrometer and consists of two thermometers which are fastened ...
An e-mail from a Moline reader recalls an instrument using thermometers to determine humidity and wants to know what it is. It's called a sling psychrometer and consists of two thermometers which are ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback