A single closed tube in a relatively simple machine can be used to carry out the entire process.

A needle or tube can be used instead of the nail.

The tube is used for the exchange of liquids, or air.

If a tube is used, the wall thickness also has an impact on the tone.

They work in a very similar way to fluorescent tubes used for lighting.

The tube had just been used as a weapon.

In the Korsakoff method, however, just one tube is used.

A plastic tube or part of the intestine may be used to make the connection.

If a single tube could not be built with the required performance, an obvious solution is to use multiple tubes, one for each color.

The difference between the two approaches lies in the number of tubes used when performing the procedure.