A tiltmeter on Mauna Loa, used to predict eruptions by measuring very small changes in the profile of the mountain. A tiltmeter is a sensitive inclinometer designed to measure very small changes from the vertical level, either on the ground or in structures.
Mr. Billion - 1977: Filming was done at the Sonoma-Marin Fairgrounds and the Petaluma Speedway. Cujo - 1983: Stephen King's horror flick about a rabies infested St. Bernard featured the Scott Ranch Hills off of Corona Rd. Explorers - 1985: A very young Ethan Hawke and River Phoenix starred in this absurd SciFi movie.
Some sources have given the drive-in site as the Studio Drive-In in Culver City, CA, but according to the film's director Randall Kleiser, the drive-in movie sequence in Grease (1978) was filmed at the Pickwick Drive-In (1100 W. Alameda Ave., Burbank, CA).