Two compasses, viz., a common compass and a dipping needle.

The bowl for the opium was made of gold, as were the dipping needle and the scissors for cutting the bricks into pills.

In 1834 Fox constructed an improved form of deflector dipping needle compass, or dip circle, for polar navigation.

"Experiments on the Dipping Needle, Made by Desire of the Royal Society."

"Description of a New Dipping Needle.

He invented an improved version of the Dipping Needle Deflector, a navigational aid for polar explorers.

The Sandia National Labs design employs a dipping needle that punctures a sample cell and discharges the spark simultaneously.