should be made as long as possible. densation the elastic membraneor tympanum will be pressed The lever and armature are suspended from the upright sup- which he continued to enjoy until within a recent date, and inward, and these vibrations will be transmitted, by the port, k, in the manner of a… … London, are all instances of the scientific progress of engi- mitted. The accomplishment of this latter result, therefore, TONE CURVES. neering, and will long remain to immortalize the names of must await the further development of the invention. their builders. It is in consequence of this defect…
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