Ted had already built a horizontal pendulum seismometer for the local Idaho Museum of Mining and Geology, where Linda volunteered. The seismometer worked well, and is still recording earthquakes today ...
Fig. 5. Aluminum legs with inner and outer pre-drilled holes. Fig. 6. Base of seismometer (upside down) showing attached legs. Fig. 7. Showing adjustable legs used to center magnets in coil. 5. Attach ...