"Found in a park near my house, in Tulsa. Old weather gauge/equipment?"
A: "I used to work on these, its a weather gauge station. The top part has a tipping bucket under a funnel and it transmits through radio every time it tips. Sometimes they have a pressure transducer running to a stream or river to calculate how much it has risen in a set amount of time."
#26 It just indicates that the camera is in use.