Synonyms:
sounder
Meaning: a device for making soundings
Usage examples
He observed an abrasion upon the bark; that, though very slight, must have been caused by contact with some substance, as hard, if not sounder, than itself.
'We shall leave behind us strong hearts and sound heads too,' said Mr. Herbert. 'And I bethink me there will be none stronger or sounder than those of your young cousins, my late pupils, of whom I hear brave things from Oxford, and in whose affection my spirit constantly rejoices.'
If, therefore, there be placed in the same circuit a regular telegraph relay and a special telephone, an operator may, by manipulating a key, operate the relay (and its sounder) without producing a sound in the telephone, as the makes and breaks of the key are far below the limit of audibility.