But supposing all these conjectures to be false, you cannot contest the inestimable benefit which I shall confer on all mankind, to the last generation, by discovering a passage near the pole to those countries, to reach which at present so many months are requisite; or by ascertaining the secret of the magnet, which, if at all possible, can only be effected by an undertaking such as mine.
I waited for my letters with feverish impatience; if they were delayed I was miserable and overcome by a thousand fears; and when they arrived and I saw the superscription of Elizabeth or my father, I hardly dared to read and ascertain my fate.
There are no more uses of "ascertain" in the book.
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A committee was formed to ascertain the level of public support for a new bike path.
The slaveholders have been known to send in spies among their slaves, to ascertain their views and feelings in regard to their condition.
Douglass, Frederick -- Narrative of the Life of Frederick Douglass An American Slave