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419 
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162; section, 190; geueral summary, 196; literature, 198. 
Rosse (Earl of). On some recent Improvements made in the Mountings of the Telescopes at Birr Castle, 
1 r o 
DO. 
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Telescopes, mountings of large, 153. 
Tuning-forks, determination of the rate of vibration of, 1. 
Voltaic action, contact theory of, 15. 
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