2 adverbs to describe how to unscrewing

The piston rods are formed with conical ends for fitting into the piston, but are coned the reverse way as in locomotives, and are secured in the piston by nuts on the ends of the rods, these nuts being provided with ratchets to prevent them from unscrewing accidentally.

Then, before his very eyes, and long ere he could unscrew the metal stopper, he saw the contents of the closed glass phial sink and lessen as though some one were drinking violently and greedily of the liquor within.

2 adverbs to describe how to  unscrewing  - Adverbs for  unscrewing