Seismic wave recorder station at Inkopah, 65 miles east of San Diego, contains battery to store solar energy transmitted from nearby installation, meter to register earth movement and relay switch which directs signal to the Caltech Seismological Laboratory. Photo dated: December 20, 1973.
If you're wondering about permissions and what you can do with this item, a good starting point is the "rights information" on this page. See our terms of use for more tips.
Share your story
Has Calisphere helped you advance your research, complete a project, or find something meaningful? We'd love to hear about it; please send us a message.