Boxing Bell

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A 10″ electric bell. Let’s make it mechanical! First, the clapper arm. Some scrap steel. Marking out the shape. Securing in a vice. Grinder with cutoff wheel to cut out the shape. Cutting out slits for the pivot hole tabs. Making tabs slightly thinner so they’ll bend easier. Bending the tabs over. Drilling out holes …

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Focal Mechanisms Explained: What are those “beach balls”? (Educational)

Focal Mechanisms Explained: What are those “beach balls”? (Educational)

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When an earthquake occurs, seismologists create graphics of focal mechanisms, informally referred to as beach balls, to show the faulting motions that produce the earthquake. The focal mechanisms are based on the direction of the first arriving P wave. Lets investigate the patterns of P-wave arrivals that result from different faulting mechanisms by first considering …

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