His head...looked like a weathercock perched upon his spindle neck to tell which way the wind blew.—Irving.

A lady once remarked, he [Coleridge] could never fix which side of the garden walk would suit him best.—Carlyle.

He was turned before long into all the universe, where it was uncertain what game you would catch, or whether any.—Id.

At what rate these materials would be distributed and precipitated in regular strata, it is impossible to determine.—Agassiz.

Adjective what in exclamations.

152. In exclamatory expressions, what (or what a) has a force somewhat like a descriptive adjective. It is neither relative nor interrogative, but might be called an EXCLAMATORY ADJECTIVE; as,—

Oh, what a revolution! and what a heart must I have, to contemplate without emotion that elevation and that fall!—Burke.

What a piece of work is man!—Shakespeare.

And yet, alas, the making of it right, what a business for long time to come!—Carlyle

Through what hardships it may attain to bear a sweet fruit!—Thoreau.