The seismograph, Model EQ-1 (Next Generation Science), is located in a second floor classroom of the Julian Science and Mathematics Center. The unit is a horizontal beam seismograph that is designed ...

That doesn’t mean you can’t keep track of doings below your feet yourself, with something like this DIY seismograph ... The business end is a simple pendulum sensor, with a heavy metal ...

The minutes are marked on the record by means of a pendulum contact-making clock (supplied by Spindler and Hoyer with Bosch-Omori seismographs), actuating a relay circuit coupled to a solenoid ...