They are more expensive due to the complex shape of the outer tube.

Perhaps it held the outer tube of the column into place?

Each gas displaces water and collects at the top of the two outer tubes.

More modern outer tube is wound from square section wire.

The other side of the power source should be connected to another piece of foil wrapped around the outer tube.

The tampon itself sits inside the outer tube, near the open end.

The outer tube was about eight inches long, with one end completely closed by the fracture.

The speed of separation - the solution only takes about 30 seconds to move through the outer tube - also prevents too much heating.

And look into glassing in one of the outer tubes, he added silently.

These outer tubes are preheated before they are slid into position.