How accurate is Kater's pendulum for measuring g?

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Lewistbh
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Hi there. I'm doing research for an investigation into various methods of measuring g for my Advanced Higher course (Scottish). I was wondering if anyone knew how accurate this experiment was when compared with a simple pendulum experiment. Also if anyone had diagrams or detailed explanations of the procedure that would be a great help.
 

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Perhaps this?
http://www.fas.harvard.edu/~scdiroff/lds/OscillationsWaves/ReversiblePendulum/ReversiblePendulum.html
 
Could anyone explain to me how and why Kater's Pendulum works?

Thanks
 
If I can find my second year lab scripts I'll have a look and see what it says. We did compare it with a simple pendulum and we got much better results.
 
Thanks, that would be really useful. The harvard link doesn't really explain the way the pendulum works.