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The seismolog: A photoelectric earthquake indicator for a Seismograph^*

DEPARTMENT OF PHYSICS JOHN CARROLL UNIVERSITY, CLEVELAND 18, OHIO

Abstract

It should be pointed out that the Seismolog provides only an indication that an earthquake has occurred. The normal process of developing and reading the seismograms is still required to determine the location and intensity of the earthquake.

Since the initial period of adjustment, the Seismolog has required servicing only twice.

On the first occasion, failure of a filter capacitor caused some slight damage to the Seismolog, owing to overheating. The possibility of recurrence was eliminated by adding the fuse system described above.

On the second occasion, the normal failure of one of the tubes in the phototube detector unit resulted in the open-circuiting of a resistor. Replacement of the tube and resistor remedied this difficulty.

With these two exceptions, the Seismolog has been in continuous and satisfactory operation at the John Carroll University Seismological Observatory since September, 1948.

Footnotes

^* Manuscript received for publication April 23, 1952.