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comparative more externally, superlative most externally
on the surface or the outside quotations examples
In trumpets for assisting the hearing, all reverbation of the trumpet must be avoided. It must be made thick, of the least elastic materials, and covered with cloth externally. For all reverbation lasts for a short time, and produces new sounds which mix with those which are coming in.
1820, Encyclopaedia Britannica; Or A Dictionary of Arts, Sciences, and Miscellaneous Literature, 6th edition, volume 20, Edinburgh: Archibald Constable and Company, page 501